---
title: "Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante"
description: "The hardworking class president. She doesn't appear to have any interest in sex, but in reality, she masturbates every evening at home. She writes down her onan"
image: "https://t.vndb.org/cv/41/114941.jpg"
---

# Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante

![Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante](https://t.vndb.org/cv/41/114941.jpg)

**Alternative Title:** 真面目な委員長がオナニー日記をつけているなんて

**Aliases:** I Can’t Believe That Serious Class Rep Keeps A Masturbation Diary

**Developer:** Dobuworks

**Release date:** Jun 18, 2018

**Platform:** Windows, iOS, Android

**Language:** English, Japanese, Chinese (simplified)

**Rating:** 5.6/10 (11 votes)

## Description
The hardworking class president.
She doesn't appear to have any interest in sex, but in reality, she masturbates every evening at home.
She writes down her onanist adventures in a diary, but one day accidently brings that notebook to school..

## Characters
### Yuzuki Yui (柚月 结衣)
She is a serious honors student who is also the class representative. At first glance, she doesn’t look like someone that’s interested in sex but in reality, she indulges in intense masturbation every night when she’s at home. She keeps a diary where she records these activities and her impressions but one day she accidentally brings this diary to school and…

[From [url=https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary/?rfsn=871632.d54765&utm_source=refersion&utm_medium=affiliate&utm_campaign=871632.d54765]Denpasoft[/url]]

- **Gender:** Female
- **Hair:** Black, Long
- **Role:** Class President, Honor Student
- **Voiced by:** Kotone Aruha

## Shops
- [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ01345584.html)

## Releases
### English
- **2018-06-18**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ396706.html)
- **2019-11-30**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ270645.html), [Denpasoft](https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary/), [JAST USA](https://jastusa.com/games/bkbk001/onanikki), [Johren](https://www.johren.games/games/download/the-earnest-committee-ch-en-zh/)
- **2022-03-11**: I Can’t Believe That Serious Class Rep Keeps A Masturbation Diary – Demo - [Denpasoft](https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary-demo/)
- **2025-05-28**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ01345584.html)

### Japanese
- **2018-06-18**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ396706.html)
- **2019-11-30**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ270645.html), [Denpasoft](https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary/), [JAST USA](https://jastusa.com/games/bkbk001/onanikki), [Johren](https://www.johren.games/games/download/the-earnest-committee-ch-en-zh/)
- **2022-03-11**: I Can’t Believe That Serious Class Rep Keeps A Masturbation Diary – Demo - [Denpasoft](https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary-demo/)
- **2025-05-28**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ01345584.html)

### Chinese (simplified)
- **2018-06-18**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ396706.html)
- **2019-11-30**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ270645.html), [Denpasoft](https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary/), [JAST USA](https://jastusa.com/games/bkbk001/onanikki), [Johren](https://www.johren.games/games/download/the-earnest-committee-ch-en-zh/)
- **2022-03-11**: I Can’t Believe That Serious Class Rep Keeps A Masturbation Diary – Demo - [Denpasoft](https://denpasoft.com/product/i-cant-believe-that-serious-class-rep-keeps-a-masturbation-diary-demo/)
- **2025-05-28**: Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante - [DLsite](https://www.dlsite.com/appx-touch/work/=/product_id/RJ01345584.html)

## Tags
Vaginal Masturbation, Ejaculation Forewarner, Production of Pornography (Amateur), Only a Single Heroine, Anal Masturbation, Humping, Dildos

## More Games from Dobuworks
- [Majime na Iinchou ga Onanii Nikki o Tsuketeiru Nante](https://pinovel.net/v49377)
- [Sennou Appli de Takabishana Ojou-sama o Suki Houdai Suru Simulation](https://pinovel.net/v49025)

---
*View the full details at [pinovel.net/v49377](https://pinovel.net/v49377).*

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