---
title: "Zaishuu -The Sin-"
description: "Following the death of their parents, Akira made it a solemn duty to ensure his sister could live a normal existence, doing everything within his power to bring"
image: "https://t.vndb.org/cv/00/116700.jpg"
---

# Zaishuu -The Sin-

![Zaishuu -The Sin-](https://t.vndb.org/cv/00/116700.jpg)

**Alternative Title:** 罪囚-The SiN-

**Developer:** Tactics

**Release date:** Sep 26, 2003

**Platform:** Windows, Website, MOB

**Language:** English, Japanese

**Rating:** 5.6/10 (248 votes)

## Description
Following the death of their parents, Akira made it a solemn duty to ensure his sister could live a normal existence, doing everything within his power to bring happiness into their inconstant lives. As Akira’s bond to Aya inevitably grew closer, others began to jealously whisper how the siblings were forging a relationship that went beyond the accepted conventions of brother and sister; allegations neither showed particular concern towards. Yet this idyllic innocence was not meant to last, and the devotion between Aya and Akira would be sorely tested by an incomprehensible world they never knew existed – a reality that threatens to smother both in malicious darkness.

[From [Eroge Review](https://web.archive.org/web/20140909125701/http://www.erogereview.com/2007/12/25/zaishuu-the-sin/)]

## Characters
### Kamijou Akira (上條 玲)
- **Gender:** Male
- **Hair:** Blue
- **Clothes:** School Uniform
- **Engages in:** Fighting, Smoking
- **Role:** Non-blood-related Brother, Superhuman, Older Brother

### Kamijou Aya (上條 彩)
Aya is Akira's little sister with a serious brother complex, who is usually staying as close to him as possible, to the point that others suspect that they have a relationship more close than a brother and a sister.

- **Gender:** Female
- **Hair:** Twin Tails, Waist Length+, Cyan
- **Body:** Teen, Pale, Wings, Big Breasts
- **Clothes:** School Uniform, Miniskirt, Thigh-high Stockings, Hairpin, Ribbon Hair Tie, Short Shorts, Off-The-Shoulder Sweater
- **Engages in:** Cooking
- **Eyes:** Violet
- **Role:** Waitstaff, Non-blood-related Sister
- **Subject of:** Kidnapping
- **Personality:** Brother Complex
- **Voiced by:** Noda Asumi

### Kusakabe Yukari (草壁 紫)
Yukari-sensei is a new art and homeroom teacher for Akira's class.

- **Gender:** Female
- **Hair:** Blond, Waist Length+
- **Body:** Pale, Young-adult, Mole, Big Breasts
- **Eyes:** Blue
- **Clothes:** Coat, Gloves, Chinese Dress, Garter Belt Stockings, Hairpin
- **Engages in:** Smoking
- **Role:** Teacher, Superhuman
- **Voiced by:** Enokizu Mao

### Okitsu Nagi (沖津 凪)
Nagi Okitsu is a demon hunter that arrived in Japan due to their increased presence in the region. She is a cold and cynical loner, preferring as little interactions with other people as possible.[spoiler]She is Keith former student[/spoiler]

- **Gender:** Female
- **Hair:** Black, Shoulder-length
- **Eyes:** Brown
- **Body:** Teen, Olive, Small Breasts
- **Items:** Sword, Dual-Wield Weapon
- **Engages in:** Swordsmanship
- **Clothes:** Coat, Pantyhose, Beret
- **Role:** Healer, Monster Hunter
- **Voiced by:** Misaki Tomomi

### Shindou Mayuki (進藤 真由紀)
Shindou Mayuki is one grade higher than Akira and president of the Art Club. Her current worry is the fact that Akira and the others don’t take the club seriously. At least that’s her outward worry. Her real worry is her own love life: it’s growing harder for her to hide her feelings towards Akira.

- **Gender:** Female
- **Hair:** Brown, Waist Length+, Braid
- **Body:** Teen, Pale, Big Breasts
- **Clothes:** School Uniform, Glasses, Headband, Necktie, Cross Necklace, Beret, Ribbon Hair Tie
- **Eyes:** Blue
- **Role:** Daughter, Wealthy, Superhuman
- **Subject of:** Possession, Coercion
- **Engages in:** Drawing
- **Personality:** Jealous
- **Voiced by:** Haruse Miki

### Cassaca (カサッカ)
Cassaca is a strange girl with a real tail who seems to live near the Kamijou house. Her left and right eyes are different colors and she easily picks up the phrases she reads in manga or hears on TV. As a result, her speech is a mess and she may speak in a dialect one day, like an Edo-period prostitute the next, or like a guy some other day.

- **Gender:** Female
- **Hair:** Shoulder-length, Kemonomimi, Grey, No Bangs
- **Body:** Slim, Pale, Kid, Furry Tail, Flat Chest
- **Eyes:** Blue, Violet, Heterochromia
- **Clothes:** Mini-dress, Ushanka, Necktie, Boots, Thigh-high Stockings, Spats
- **Role:** Non-human, Dog, Pet
- **Engages in:** Betrayal
- **Voiced by:** Ayukawa Hinata

### Omi Atsumi (臣 温美)
Omi Atsumi is one of Aya’s classmates and one of the few people who aren’t afraid to approach either Aya or Akira with a smile despite his tendency to push others away. Her ability to take action has made her the hope of the Newspaper Club. However, her motivation often goes overboard and many students tremble with fear to see a camera in her hands.

- **Gender:** Female
- **Alias:** Narumi
- **Hair:** Red
- **Eyes:** Brown
- **Role:** Waitstaff
- **Engages in:** Mind Control
- **Items:** Video Camera
- **Voiced by:** Hokuto Minami

## Shops
- [Official Website](http://tactics.nexton-net.jp/old_tactics/product/zaishu/index.htm)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ004681.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=24545)

## Releases
### Japanese
- **2003-08-15**: Zaishuu -The SiN- Trial Edition - [Official website](http://tactics.nexton-net.jp/old_tactics/product/zaishu/download.htm)
- **2003-09-26**: Zaishuu -The SiN- Package Edition - [Official website](http://tactics.nexton-net.jp/old_tactics/product/zaishu/index.htm), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=3018), [Getchu](http://www.getchu.com/soft.phtml?id=24545)
- **2007-02-02**: Bishoujo Game Best Series - Zaishuu -The SiN- - [Official website](http://tactics.nexton-net.jp/old_tactics/product/zaishu/index.htm)
- **2007-03-16**: Zaishuu -The Sin- - [Official website](https://web.archive.org/web/20070616124830/http://pm.d-dream.com/mobile.php)
- **2010-03-05**: Zaishuu -The SiN- Download Edition - [Official website](http://tactics.nexton-net.jp/old_tactics/product/zaishu/index.htm), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ004681.html), [Animate Games](https://www.animategames.jp/home/detail/44016), [Gyutto](https://gyutto.com/i/item32929), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0041430/), [DL.Getchu](http://dl.getchu.com/i/item1002367), [DMM](https://dlsoft.dmm.co.jp/detail/next_0048/)
- **2020-04-24**: Zaishuu -The SiN- - [Official website](https://web.archive.org/web/20250416175942/https://oo.parts/title/CEkT2RMXKclRYlSTbjUx)
- **TBA**: Zaishuu -The Sin- Decensor Patch - [Official website](https://sponsr.ru/checkout?project=kuroneko&lid=32891&type=subscribe)

### English
- **2011-03-14**: Guilty  _The SiN_ Download Edition - [MangaGamer](https://www.mangagamer.com/r18/detail.php?product_code=8)
- **2011-07-01**: Guilty _The SiN_ Package Edition - [Official website](https://web.archive.org/web/20160428024005/http://www.mangagamer.com/detail.php?goods_type=3&product_code=207), [PlayAsia](https://www.play-asia.com/13/704fus)

## Tags
Vampire, Horror, Sexual Content, ADV, Fighting Heroine, Unarmed Combat, Rape, Incest, Non-blood-related Incest, Brother/Sister Romance, Protagonist's Senpai as a Heroine, Unavoidable Rape, Male Protagonist, Fighting Protagonist, Loli Heroine, Foolish Friend, Teacher Heroine, Tentacle Rape, Ojousama Heroine, Heroine with Glasses, Spontaneous Sex Scenes, Monster Hunter Heroine, Demon Heroine, Fictional Modern Day Japanese Town, Protagonist's Non-blood-related Sister as a Heroine, Reverse Rape, Group Sex of One Female and Several Males, Pregnant Sex, Under the Same Roof, Kemonomimi Heroine, Demons, Heroine with Heterochromia, Nympho Heroine, Netorare, Big Breast Sizes Heroine, Class President Heroine, Unavoidable Heroine Rape, Small Breast Sizes Heroine (Non-Loli), Dark Skinned Heroine, Futanari Support Character, Other Perspectives, Painter Heroine, Bad Ending(s), Defloration, Sex in Public Places, Boobjob, Only Virgin Heroines, Smoker Heroine, Smoker Protagonist, Orphan Protagonist, Foreigner Heroine, Game Over, Sixty-nine, Blowjob, Impregnation, Albino Heroine, Lots of Choices, Masturbation, Dual Wielding Swords, Heroine with Chinese Dress, Inumimi Heroine, Brocon Heroine, Monster Birth, Netorare Type C, Pregnancy Bad Ending, Heroine with Big Breasts, Single Blowjob, Heroine with Small Breasts (Non-Loli), Bad Endings with Story, Non-blood-related Brother/Sister Incest, Single Boobjob, Double Handjob, Twin Handjob, Protagonist's Younger Sister as a Heroine, Protagonist's Full Sister as a Heroine

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---
*View the full details at [pinovel.net/v3994](https://pinovel.net/v3994).*

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```