1 Year of Service
- Allow others to update?
- yes
- Developer Name
- Countercurrent Tea Party
- Developer Links
- Version
- 1.0.5
- Latest Update
- Apr 3, 2026
- Release Date
- Jan 10, 2026
- Language
- English
- OS
- Windows
- Linux
- MacOS
- Android
Overview:
Living with your sister x action battle x roguelike x open world fantasy RPG game!
The player plays a solo adventurer in the dungeon while living with his sister.
In order to cure his sister’s special constitution,
he constantly searches for materials to make the all-purpose elixir “red cerebrospinal fluid” in the Abyss.
If he cannot complete it within the time limit, his sister…!
2dcg, 2d game, male protagonist, incest, japanese game, fantasy, adventure, groping, voyeurism, big ass, big tits, monster girl, monster, combat, sandbox, mobile game
Extract and run
v0.95f
TBA
v0.9
- Implemented the first phase of the Living Room H-scene event
- Added a drowsy/“nodding off” event when the Imouto waits for too long
- Implemented the Onii-chan bankruptcy / pocket money event
- Added the weather forecast TV program
- Added the confession option to the Fallen Church
- Implemented the Jackalope / the Unspeakable G enemies
v0.85
- Implemented the sumata event in the bathroom.
- Some new TV programs have been added!
- You can now safely return to the game when an error occurs.
- The bath scene with Imouto has been remade and expanded with new content.
- The PC version’s game engine has been updated! (you’ll need to re-download the game)
- The game’s official abbreviation has been decided as “Usuimo”!
- You can use this short name to refer to the game from now on!
v0.82
- Added Maid Bunny boss fight
- Added River Lord boss fight
- Added more details to the Mecha Encounter event
- Remade the bomb-fishing gameplay
- Added new items and equipment
- Added a new enemy
v0.81
- You can trigger the boss fight by feeding ASABA a special strawberry
- The Hunter’s Cabin is now accessible
- Added more details to the new map
- Servants and players no longer have physical collision
- Adjusted the unreasonable durability growth curve of Ancient Tree Remnants
- Adjusted the rules for melee weapons with additional magic damage
- Added a new Anvil item for weapon repair
- Added 16 new pieces of equipment
- Added a new enemy
v0.80
- Added a new event where the Imouto cooks.
- Added a new event where food ingredients run short.
- Added several new maps.
- Added Traditional Chinese conversion support.
- Added AZERTY keyboard conversion support for players in France.
- Added scrollable sliding bars to the inventory and equipment menus.
v0.79
- Added new content to the event where you peek at Imouto changing clothes
- Added new content to the event where Imouto cries from eating something too spicy
- Added a living room scene where you can watch TV together with Imouto
- Optimized some animation file sizes to reduce frame drops
- Improved save file recognition – now supports backward compatibility with version 0.22A saves
- Experimentally added Russian language support
- Optimized save transfer functionality on the Android version
- Restored automatic update functionality for the Android version
- There is a small chance for mysterious little creatures to appear in the forest
- Fish will now appear in the river
- Added a new enemy to the Catacombe
- Added a new weapon drop to the Red Beast boss
v0.77
- Released and synced new builds for Android, macOS, and Linux
- Added a toilet blowjob event and animation
- Updated the washroom handjob event with a new animation
- Added a new “Nightmare” event
- Added more animations to the title screen
- Improved the process of Onii-chan learning ninja skills
- Onii-chan has learned a new ninja skill
- Added a new setting to lock the game at 60 FPS Fixed font display issues in the English and Japanese versions Fixed a bug where auto-updates could trigger incorrectly
v0.75
- Added new content to the scene where you peek at Imouto taking a bath
- Added new motion variations and facial expressions to Imouto's Sprite
- Added new content to the morning scene where you wake up Imouto
- Remade the performance and interaction mechanics in some scenes
- Implemented ninja-type skills, which can be learned from a new NPC
- Updated the appearance of the vending machine and enabled the purchase of specified drinks
- Optimized the recognition of certain cooking recipes to make them easier to trigger
- Implemented a food poisoning event. Eating poisonous ingredients or failed dishes may cause the onii-chan to get food poisoning
- Updated the game engine to optimize stuttering and frame drop issues
- Optimized the destruction effect when a weapon's durability reaches zero
- Implemented the initial version of the enemy "elite" system
v0.72
- Optimized the game’s backend, so now old save files from any version after 0.26 should work just fine
- Added more ways to gain affection from Imouto — now drinking tea or having milk after a bath boosts it too!
- Now you can choose what drink and snack to have during tea time!
- Initial implementation of the blue konpeitō effect
- Added cola item — when you get it, it can trigger special events during hot weather
- Reworked the animation for Imouto making food! The option to ask her to make dinner will be added in a later update
- Improved the auto-update detection — now when a new update is available, an update icon will appear above Imouto’s head and disappear automatically after updating
- Added an interior map for the Star Gate — items dropped inside will no longer vanish
- While the equipment menu is open, bullets will also pause
- Increased initial equipment slots from 20 to 40
- A new quick-access button for system settings has been added to the screen.
- Added a status countdown timer
v0.70D
- Fixed known bugs
v0.70C
- Fixed various bugs that could cause crashes or softlocks
- When migrating old saves from version 0.66 to 0.70C, your equipment will no longer be deleted. (Note: Any equipment that has already been deleted cannot be restored.)
- Synced the latest player login messages for the Ansuz Rune.
- This update will be applied automatically through the in-game auto-update feature. (It will trigger when onii-chan goes to sleep at night.) So, you don’t need to re-download the entire game!
v0.70B
- Fixed known bugs
v0.70A
- Fixed known bugs
v0.70
- Partially implemented additional Imouto handjob animation in the washroom (requires future updates).
- Partially implemented Imouto blowjob animation in the toilet (requires future updates).
- Added an option to skip the morning routine after waking up.
- Changed the trigger conditions for shampoo-related events—new interactions available when Onii-chan bathing alone.
- Added unarmed combat abilities for Onii-chan.
- Implemented new weapons and gears.
- Optimized bow attack mode.
- Implemented the Shop Cart, currently only summonable via the "Chariot" Tarot Card.
- Partially implemented Rune "Ansuz", allowing players to write messages visible to others.
- Optimized the auto-update trigger mechanism.
v0.66C
+ Fixed known bugs.
+ Added an experimental feature for automatically downloading update patches to fix bugs.
v0.66
+ Added more styles of Imouto’s panties.
+ Implemented an initial version of the H-event where Imouto helps onii-chan masturbate in the washroom.
+ Fixed click detection in the washroom scene, allowing events to be triggered by clicking the prompt icon.
+ Increased the frame count of Imouto’s milk-drinking animation.
+ Added four new harvestable vegetables and three new recipe formulas.
+ Improved the visual effects of equipment changes; right-clicking an equipped item now instantly unequips it.
+ Reduced the drop rate of weapons from enemies and increased the base durability of some weapons.
+ Implemented magic resistance for both players and enemies, reducing magic damage based on a percentage.
+ Reworked the Summon Gate of the Stars and Gacha Machine systems, now allowing custom summon locations.
+ The quick-use item wheel can now display up to five items at once.
v0.65B
+ Added a small animation for Imouto feeling sleepy.
+ Fixed various bugged event triggers in Imouto's room.
+ Summoning the Star Door will now immediately move you in front of it if it is already present.
v0.65A
+ Fixed known bugs
v0.65
+ Fixed some known bugs
+ Added an option to peek at Imouto while she’s bathing
+ Added a new animation of Imouto drinking milk after bathing
+ Added an anti-misclick effect in the cooking menu
+ Defeating the BOSS within a time limit will now spawn a special portal
+ The weapon inventory will now open automatically when a weapon breaks
+ Optimized the Abyss enemy & loot reset command to make it less likely to fail
+ Improved the display of item descriptions, now they are automatically generated The "Always Show Durability" setting now also applies to weapons in the inventory
+ Added 15 new pieces of equipment
v0.60C
- Fixed known bugs.
- Fixed the bug where the konpeito event couldn’t be triggered.
- Added a weapon durability display feature. Hover over the weapon slot to check the remaining durability.
v0.60B
- Fixed known bugs
- Fixed a bug where clicking to wake up Imouto in the morning caused an error.
- Adjusted the durability calculation method for staff weapons.
- Temporarily increased the encounter rate of the Mysterious Shop,
v0.60A
- Fixed known bugs
- Updated the tutorial and some UI elements
v0.60
-Due to the implementation of a lot of new content and changes to the core code, old save files may not be compatible. It’s recommended to start a new save file for this update.
-Added an event where you wake up Imouto in the morning
-Added an event for when Imouto eats the pink konpeito
-Implemented a quick head-patting interaction button with corresponding facial reactions from Imouto
-Added sleepy facial expressions for Imouto after 9 PM
-Implemented small scene objects with corresponding descriptions
-Added some new UI elements
-Introduced a weapon durability system
-Added a mechanic for fruit trees to respawn on the map for collection
-Implemented a mysterious shop
-Added 6 new types of slimes
-Introduced several new pieces of equipment
-Optimized the mechanics of the Red Beast boss
v0.55B
+ Fixed known bugs.
v0.55A
+ Fixed known bugs.
v0.55
+ Redesigned the artwork for the sister after bathing and added an event for drying her hair.
+ Improved the effects for monster death animations.
+ Enhanced the item drop animations for monsters and added a notification sound.
+ Added a new idle animation for onii-chan.
v0.50D Beta
Added event where the sister experiences her first healing.
Added event related to the sister waking up early.
Introduced a new special weather type and related events.
Added daytime home events.
Performed system-level optimizations (additional content coming in the next version).
v0.21
N/A
v0.2
Added interaction events with the sister after obtaining the game console.
Added the option and event for taking a bath with the sister.
Added the bathroom scene and related events.
Fixed some leftover bugs from version 0.1.
Completely reworked the ARPG system; please be patient as content is added.
Added new monster types.
Added new map types.
v0.18d
This update fixes almost all known bugs since version V0.1, making it a stable version to play. However, due to limited manpower, there may still be some bugs we haven't discovered. You can leave feedback in the comments section of this post or join NLCH's Discord server. We'll fix any issues as quickly as possible.
Please note not to use old version save files, as this might cause old bugs to reappear. For your convenience, you can now hold down the ALT key to play the game at three times the speed, but be aware that this feature might make the game unstable, so use it at your discretion.
TBA
v0.9
- Implemented the first phase of the Living Room H-scene event
- Added a drowsy/“nodding off” event when the Imouto waits for too long
- Implemented the Onii-chan bankruptcy / pocket money event
- Added the weather forecast TV program
- Added the confession option to the Fallen Church
- Implemented the Jackalope / the Unspeakable G enemies
v0.85
- Implemented the sumata event in the bathroom.
- Some new TV programs have been added!
- You can now safely return to the game when an error occurs.
- The bath scene with Imouto has been remade and expanded with new content.
- The PC version’s game engine has been updated! (you’ll need to re-download the game)
- The game’s official abbreviation has been decided as “Usuimo”!
- You can use this short name to refer to the game from now on!
v0.82
- Added Maid Bunny boss fight
- Added River Lord boss fight
- Added more details to the Mecha Encounter event
- Remade the bomb-fishing gameplay
- Added new items and equipment
- Added a new enemy
v0.81
- You can trigger the boss fight by feeding ASABA a special strawberry
- The Hunter’s Cabin is now accessible
- Added more details to the new map
- Servants and players no longer have physical collision
- Adjusted the unreasonable durability growth curve of Ancient Tree Remnants
- Adjusted the rules for melee weapons with additional magic damage
- Added a new Anvil item for weapon repair
- Added 16 new pieces of equipment
- Added a new enemy
v0.80
- Added a new event where the Imouto cooks.
- Added a new event where food ingredients run short.
- Added several new maps.
- Added Traditional Chinese conversion support.
- Added AZERTY keyboard conversion support for players in France.
- Added scrollable sliding bars to the inventory and equipment menus.
v0.79
- Added new content to the event where you peek at Imouto changing clothes
- Added new content to the event where Imouto cries from eating something too spicy
- Added a living room scene where you can watch TV together with Imouto
- Optimized some animation file sizes to reduce frame drops
- Improved save file recognition – now supports backward compatibility with version 0.22A saves
- Experimentally added Russian language support
- Optimized save transfer functionality on the Android version
- Restored automatic update functionality for the Android version
- There is a small chance for mysterious little creatures to appear in the forest
- Fish will now appear in the river
- Added a new enemy to the Catacombe
- Added a new weapon drop to the Red Beast boss
v0.77
- Released and synced new builds for Android, macOS, and Linux
- Added a toilet blowjob event and animation
- Updated the washroom handjob event with a new animation
- Added a new “Nightmare” event
- Added more animations to the title screen
- Improved the process of Onii-chan learning ninja skills
- Onii-chan has learned a new ninja skill
- Added a new setting to lock the game at 60 FPS Fixed font display issues in the English and Japanese versions Fixed a bug where auto-updates could trigger incorrectly
v0.75
- Added new content to the scene where you peek at Imouto taking a bath
- Added new motion variations and facial expressions to Imouto's Sprite
- Added new content to the morning scene where you wake up Imouto
- Remade the performance and interaction mechanics in some scenes
- Implemented ninja-type skills, which can be learned from a new NPC
- Updated the appearance of the vending machine and enabled the purchase of specified drinks
- Optimized the recognition of certain cooking recipes to make them easier to trigger
- Implemented a food poisoning event. Eating poisonous ingredients or failed dishes may cause the onii-chan to get food poisoning
- Updated the game engine to optimize stuttering and frame drop issues
- Optimized the destruction effect when a weapon's durability reaches zero
- Implemented the initial version of the enemy "elite" system
v0.72
- Optimized the game’s backend, so now old save files from any version after 0.26 should work just fine
- Added more ways to gain affection from Imouto — now drinking tea or having milk after a bath boosts it too!
- Now you can choose what drink and snack to have during tea time!
- Initial implementation of the blue konpeitō effect
- Added cola item — when you get it, it can trigger special events during hot weather
- Reworked the animation for Imouto making food! The option to ask her to make dinner will be added in a later update
- Improved the auto-update detection — now when a new update is available, an update icon will appear above Imouto’s head and disappear automatically after updating
- Added an interior map for the Star Gate — items dropped inside will no longer vanish
- While the equipment menu is open, bullets will also pause
- Increased initial equipment slots from 20 to 40
- A new quick-access button for system settings has been added to the screen.
- Added a status countdown timer
v0.70D
- Fixed known bugs
v0.70C
- Fixed various bugs that could cause crashes or softlocks
- When migrating old saves from version 0.66 to 0.70C, your equipment will no longer be deleted. (Note: Any equipment that has already been deleted cannot be restored.)
- Synced the latest player login messages for the Ansuz Rune.
- This update will be applied automatically through the in-game auto-update feature. (It will trigger when onii-chan goes to sleep at night.) So, you don’t need to re-download the entire game!
v0.70B
- Fixed known bugs
v0.70A
- Fixed known bugs
v0.70
- Partially implemented additional Imouto handjob animation in the washroom (requires future updates).
- Partially implemented Imouto blowjob animation in the toilet (requires future updates).
- Added an option to skip the morning routine after waking up.
- Changed the trigger conditions for shampoo-related events—new interactions available when Onii-chan bathing alone.
- Added unarmed combat abilities for Onii-chan.
- Implemented new weapons and gears.
- Optimized bow attack mode.
- Implemented the Shop Cart, currently only summonable via the "Chariot" Tarot Card.
- Partially implemented Rune "Ansuz", allowing players to write messages visible to others.
- Optimized the auto-update trigger mechanism.
v0.66C
+ Fixed known bugs.
+ Added an experimental feature for automatically downloading update patches to fix bugs.
v0.66
+ Added more styles of Imouto’s panties.
+ Implemented an initial version of the H-event where Imouto helps onii-chan masturbate in the washroom.
+ Fixed click detection in the washroom scene, allowing events to be triggered by clicking the prompt icon.
+ Increased the frame count of Imouto’s milk-drinking animation.
+ Added four new harvestable vegetables and three new recipe formulas.
+ Improved the visual effects of equipment changes; right-clicking an equipped item now instantly unequips it.
+ Reduced the drop rate of weapons from enemies and increased the base durability of some weapons.
+ Implemented magic resistance for both players and enemies, reducing magic damage based on a percentage.
+ Reworked the Summon Gate of the Stars and Gacha Machine systems, now allowing custom summon locations.
+ The quick-use item wheel can now display up to five items at once.
v0.65B
+ Added a small animation for Imouto feeling sleepy.
+ Fixed various bugged event triggers in Imouto's room.
+ Summoning the Star Door will now immediately move you in front of it if it is already present.
v0.65A
+ Fixed known bugs
v0.65
+ Fixed some known bugs
+ Added an option to peek at Imouto while she’s bathing
+ Added a new animation of Imouto drinking milk after bathing
+ Added an anti-misclick effect in the cooking menu
+ Defeating the BOSS within a time limit will now spawn a special portal
+ The weapon inventory will now open automatically when a weapon breaks
+ Optimized the Abyss enemy & loot reset command to make it less likely to fail
+ Improved the display of item descriptions, now they are automatically generated The "Always Show Durability" setting now also applies to weapons in the inventory
+ Added 15 new pieces of equipment
v0.60C
- Fixed known bugs.
- Fixed the bug where the konpeito event couldn’t be triggered.
- Added a weapon durability display feature. Hover over the weapon slot to check the remaining durability.
v0.60B
- Fixed known bugs
- Fixed a bug where clicking to wake up Imouto in the morning caused an error.
- Adjusted the durability calculation method for staff weapons.
- Temporarily increased the encounter rate of the Mysterious Shop,
v0.60A
- Fixed known bugs
- Updated the tutorial and some UI elements
v0.60
-Due to the implementation of a lot of new content and changes to the core code, old save files may not be compatible. It’s recommended to start a new save file for this update.
-Added an event where you wake up Imouto in the morning
-Added an event for when Imouto eats the pink konpeito
-Implemented a quick head-patting interaction button with corresponding facial reactions from Imouto
-Added sleepy facial expressions for Imouto after 9 PM
-Implemented small scene objects with corresponding descriptions
-Added some new UI elements
-Introduced a weapon durability system
-Added a mechanic for fruit trees to respawn on the map for collection
-Implemented a mysterious shop
-Added 6 new types of slimes
-Introduced several new pieces of equipment
-Optimized the mechanics of the Red Beast boss
v0.55B
+ Fixed known bugs.
v0.55A
+ Fixed known bugs.
v0.55
+ Redesigned the artwork for the sister after bathing and added an event for drying her hair.
+ Improved the effects for monster death animations.
+ Enhanced the item drop animations for monsters and added a notification sound.
+ Added a new idle animation for onii-chan.
v0.50D Beta
Added event where the sister experiences her first healing.
Added event related to the sister waking up early.
Introduced a new special weather type and related events.
Added daytime home events.
Performed system-level optimizations (additional content coming in the next version).
v0.21
N/A
v0.2
Added interaction events with the sister after obtaining the game console.
Added the option and event for taking a bath with the sister.
Added the bathroom scene and related events.
Fixed some leftover bugs from version 0.1.
Completely reworked the ARPG system; please be patient as content is added.
Added new monster types.
Added new map types.
v0.18d
This update fixes almost all known bugs since version V0.1, making it a stable version to play. However, due to limited manpower, there may still be some bugs we haven't discovered. You can leave feedback in the comments section of this post or join NLCH's Discord server. We'll fix any issues as quickly as possible.
Please note not to use old version save files, as this might cause old bugs to reappear. For your convenience, you can now hold down the ALT key to play the game at three times the speed, but be aware that this feature might make the game unstable, so use it at your discretion.
Original illustrator group NLCH,is creating cute & ecchi waifus, mainly post uncensored doujinshi and illustration
Original fan project "Countercurrent Tea Party", mainly publishes fan books and illustrations of Countercurrent Tea Party on Patreon.
She is an illustrator and manga artist and is currently active in the doujin circle "Gyakuryu Chakai." She publishes doujinshi and illustrations of Gyakuryu Chakai on Patreon.
Everyone, come and play! Feel free to join the fun! Everyone is welcome to come and play!
Original fan project "Countercurrent Tea Party", mainly publishes fan books and illustrations of Countercurrent Tea Party on Patreon.
She is an illustrator and manga artist and is currently active in the doujin circle "Gyakuryu Chakai." She publishes doujinshi and illustrations of Gyakuryu Chakai on Patreon.
Everyone, come and play! Feel free to join the fun! Everyone is welcome to come and play!
DOWNLOAD
Note: The game has an updater to update the version to 1.05!
Win:
Linux: - - - -
Mac: - - - -
Android: - - - - - - -
Note: The game has an updater to update the version to 1.05!
Win:
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- - Linux: - - - -
Mac: - - - -
Android: - - - - - - -
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