11 Days of Service
- Developer Name
- Jinsei Tsukoudome
- Developer Links
- Version
- v1.0.1
- Latest Update
- Apr 9, 2026
- Release Date
- Mar 26, 2026
- Language
- English (AI MTL)
- OS
- Windows
Overview:
It's springtime, and spring break is just around the corner
I was spending my days with my childhood friend, Koto, in a way that was neither good nor bad.
But I'm a young man now, and I want to take my relationship with Koto-nee a step further as I go to college!
Even though I thought that, I couldn't quite bring myself to do it.
Then one day, Koto-nee made a suggestion.
"If Akito becomes a regular on the club, I'll grant you one wish."
My new life began with a sudden and unexpected opportunity.
2dcg, Japanese Game, Censored, Male Protagonist, Voiced, Big Tits, Netorare, Oral Sex, Vaginal Sex, Virgin, Ahegao, Titfuck, Sex Toys, Pregnancy, Creampie, Cheating, School Setting, Multiple Endings
Please note: the UI is not translated for the current version.
Run the game in Japanese Locale.
1. Extract and run the game in Japanese Locale, or use
Run the game in Japanese Locale.
1. Extract and run the game in Japanese Locale, or use
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.An ADV game where your childhood sweetheart, who you've been with your whole life, is seduced and corrupted by a despicable man. Features 43 basic HCGs and 66 H-scene recollections.
▼Concept▼
I've always personally enjoyed stories about infidelity, especially those where the woman is seduced by a sleazy, womanizing guy, so I created this series myself, and this is the 11th installment.
The point we focused on most this time was the "unconquerable heroine" aspect.
A heroine who is intelligent, has keen intuition, and is physically strong.
To depict the lover who employs every possible scheme to corrupt the heroine, we have prepared more than 10 different (from the lover's perspective) bad endings.
▼Recommended for people like this▼
・Those who like the scenario of being cheated on by a playboy
This is the minimum requirement.
The story carefully depicts the process of the protagonist dating his childhood friend, the heroine who was like an older sister to him, and gradually deepening their relationship as lovers.
This story is for those who enjoy stories where the heroine is seduced by another man and gradually molded to the seducer's tastes.
・For those who want to see what happens after being cheated on
The heroine gets cheated on, but that's not the end of it; in fact, that's when the real story begins.
The story depicts the heroine's gradual descent into sexual pleasure as she has sex with another man, all from her perspective.
▼Features▼
• Amount of text
This time, the amount of text will be the largest ever, at approximately 1600kb.
• Number of HCGs
The basic number of HCGs is 43 (excluding variations). There are 66 scene recollection slots.
The original artwork and coloring are handled by DekU, who worked on our circle's representative works, "Honto no Kimochi," "Honto no Kimochi Plus," and "Egao no Riyuu."
·audio
The girl's voice is fully voiced, totaling approximately 6200 words and over 10 hours of dialogue.
The voice actress for this role is Rei Hanagasa.
▼Character Introduction▼
◎Akito Yanagi
The protagonist of this work.
He was a perfectly ordinary boy.
Kotone and I have always had a close, sibling-like relationship since childhood, but lately, I've started to become strongly aware of her as a member of the opposite sex, as she's becoming more and more beautiful every day.
However, I'm afraid of ruining our current relationship as childhood friends, so I can't bring myself to confess my feelings.
At that moment, Kotone presented me with a certain condition...
◎ Kotone Matsu (CV: Rei Hanagasa)
The heroine of this work.
The protagonist's childhood friend, who is one year older.
She is a talented woman who excels at everything from studying and sports to cooking, and with her idol-like looks, she is very popular with both men and women.
At first glance, she has a refined and mature aura, but she still retains childlike traits, such as a mischievous side, and once angered, she can be terrifying.
She is very caring and treats Akito like an older sister, doting on him, but at the same time, she also sees him as a fun toy to play with, and while she is aware of Akito's feelings, she also enjoys using them as material for jokes.
◎Yanagi Takeshi
He is the protagonist's cousin, one year younger than him, and Kotone's childhood friend.
I used to play with the main characters often, but we've drifted apart ever since my parents moved away due to their jobs.
This time, since my parents are on a business trip abroad, I'll be staying at Akito's house.
She has a very meticulous personality and is highly skilled at cooking, baking, and housework.
However, he is aware that he is not good-looking, and this is merely a means to improve his chances with women. He uses these tactics to have relationships with many women, showing he has a very bad reputation with women.
▼Concept▼
I've always personally enjoyed stories about infidelity, especially those where the woman is seduced by a sleazy, womanizing guy, so I created this series myself, and this is the 11th installment.
The point we focused on most this time was the "unconquerable heroine" aspect.
A heroine who is intelligent, has keen intuition, and is physically strong.
To depict the lover who employs every possible scheme to corrupt the heroine, we have prepared more than 10 different (from the lover's perspective) bad endings.
▼Recommended for people like this▼
・Those who like the scenario of being cheated on by a playboy
This is the minimum requirement.
The story carefully depicts the process of the protagonist dating his childhood friend, the heroine who was like an older sister to him, and gradually deepening their relationship as lovers.
This story is for those who enjoy stories where the heroine is seduced by another man and gradually molded to the seducer's tastes.
・For those who want to see what happens after being cheated on
The heroine gets cheated on, but that's not the end of it; in fact, that's when the real story begins.
The story depicts the heroine's gradual descent into sexual pleasure as she has sex with another man, all from her perspective.
▼Features▼
• Amount of text
This time, the amount of text will be the largest ever, at approximately 1600kb.
• Number of HCGs
The basic number of HCGs is 43 (excluding variations). There are 66 scene recollection slots.
The original artwork and coloring are handled by DekU, who worked on our circle's representative works, "Honto no Kimochi," "Honto no Kimochi Plus," and "Egao no Riyuu."
·audio
The girl's voice is fully voiced, totaling approximately 6200 words and over 10 hours of dialogue.
The voice actress for this role is Rei Hanagasa.
▼Character Introduction▼
◎Akito Yanagi
The protagonist of this work.
He was a perfectly ordinary boy.
Kotone and I have always had a close, sibling-like relationship since childhood, but lately, I've started to become strongly aware of her as a member of the opposite sex, as she's becoming more and more beautiful every day.
However, I'm afraid of ruining our current relationship as childhood friends, so I can't bring myself to confess my feelings.
At that moment, Kotone presented me with a certain condition...
◎ Kotone Matsu (CV: Rei Hanagasa)
The heroine of this work.
The protagonist's childhood friend, who is one year older.
She is a talented woman who excels at everything from studying and sports to cooking, and with her idol-like looks, she is very popular with both men and women.
At first glance, she has a refined and mature aura, but she still retains childlike traits, such as a mischievous side, and once angered, she can be terrifying.
She is very caring and treats Akito like an older sister, doting on him, but at the same time, she also sees him as a fun toy to play with, and while she is aware of Akito's feelings, she also enjoys using them as material for jokes.
◎Yanagi Takeshi
He is the protagonist's cousin, one year younger than him, and Kotone's childhood friend.
I used to play with the main characters often, but we've drifted apart ever since my parents moved away due to their jobs.
This time, since my parents are on a business trip abroad, I'll be staying at Akito's house.
She has a very meticulous personality and is highly skilled at cooking, baking, and housework.
However, he is aware that he is not good-looking, and this is merely a means to improve his chances with women. He uses these tactics to have relationships with many women, showing he has a very bad reputation with women.
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