---
title: "Hatsukoi no Houteishiki"
description: "A boy realizes he has a crush on his best friend."
image: "https://t.vndb.org/cv/96/16696.jpg"
---

# Hatsukoi no Houteishiki

![Hatsukoi no Houteishiki](https://t.vndb.org/cv/96/16696.jpg)

**Alternative Title:** 初恋の方程式

**Developer:** BL Declaration!

**Release date:** Feb 1, 2013

**Platform:** Windows

**Language:** Japanese

**Rating:** 5.8/10 (avg, 2 votes)

## Description
A boy realizes he has a crush on his best friend.

## Characters
### Saitou Yuki (斉藤 由貴)
- **Gender:** Male
- **Hair:** Blue, Short
- **Body:** Teen
- **Clothes:** Hairpin
- **Subject of:** Homicide
- **Role:** Younger Brother

### Mikuni Keito (三國 啓人)
- **Gender:** Male
- **Hair:** Brown
- **Eyes:** Brown
- **Body:** Teen
- **Role:** Friend
- **Engages in:** Murder
- **Subject of:** Being Drugged
- **Clothes:** Gakuran
- **Voiced by:** Hirasawa Tomoe

### Saitou Takuma (斉藤 拓真)
- **Gender:** Male
- **Hair:** Blue, Short
- **Body:** Young-adult
- **Role:** University Student, Older Brother
- **Subject of:** Homicide, Asphyxia
- **Engages in:** Drugging
- **Voiced by:** Guy Guy

### Convenience Store Clerk (コンビニ店員)
- **Gender:** Female
- **Role:** Shop Clerk
- **Voiced by:** Oowarai

### Girl (女の子)
- **Gender:** Female
- **Role:** Figment
- **Voiced by:** Nishina Makoto

### Homeroom Teacher (担任教師)
- **Gender:** Female
- **Role:** Homeroom Teacher
- **Voiced by:** Kaneda Kokichi

## Shops
- [Official Website](http://blxxxdeclaration.web.fc2.com/game/main_game-002.html)

## Releases
### Japanese
- **2013-02-01**: Hatsukoi no Houteishiki - [Official website](http://blxxxdeclaration.web.fc2.com/game/main_game-002.html), [Freem!](https://www.freem.ne.jp/win/game/4560)

## Tags
ADV, Male on Male Sex, Male Protagonist, Protagonist with Voice Acting, Multiple Endings, Protagonist's Brother as a Support Character, One True End, High Sexual Content, Netorare, Sex Involving Drugs, Protagonist with a Face, Male on Male Rape, Anal Penetration, Sixty-nine, Sounds of Copulation, Masturbation, High School Student Protagonist, Consumption of Pornography, Seme Protagonist, Reversible Yaoi Pairing, Uke Protagonist, Protagonist with a Sprite, Boy x Boy Romance Only, Male Homosexual NTR, Seke Protagonist

## More Games from BL Declaration!
- [Kako ~Recall the past~](https://pinovel.net/v12968)
- [Hatsukoi no Houteishiki](https://pinovel.net/v12918)
- [Koi to Yuujou no Kyoukaisen](https://pinovel.net/v13241)

---
*View the full details at [pinovel.net/v12918](https://pinovel.net/v12918).*

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```