The Switch version of "Koigoku" is set in postwar Ueno, Tokyo. Detective Akigo Takagi investigates the whereabouts of his former lover Yura Kazuki and becomes entangled in a local serial murder case.
| Title of the work | カルタグラ |
|---|---|
| Chinese name | Love in prison ~ Moon madness ~ |
| The publication date listed in the materials | 2026-02-05 |
| Platform | Nintendo Switch / PC |
| Genre | ミステリィアドベンチャー |
| Also known as | CARTAGRA |
| Development | Innocent Grey |
| Release | Prototype Co., Ltd |
| Script | Miya Suzuka / Kazuhiko Iida (Original Scenario) |
| Key animation | Sugina Mizuhime |
| Music | MANYO |
| Game engine | Luca System |
| Website address recorded by the source | https://www.prot.co.jp/switch/cartagra/index.html |
| External links to source records | https://store-jp.nintendo.com/item/software/D70010000100295 / https://store.steampowered.com/app/4290390/ |
Seeking someone entrusted to him
After leaving the police force, Shugo Takagi stayed in Ueno at Yukishiro and was investigated by his former boss, Kazuma Arishima. He was searching for Yura Tsukimi, who had once dated him. Yura's younger sister Kazuna hopes to find her sister, but their father Keiichirou insists Yura is already dead; Conflicting family statements became the starting point of the case.
A character from Ueno
Qiuwu's younger sister, Qiqi, is also investigating a serial murder case. He managed the snow-white Amezuku and looked after Hatsune and Rin from Akigo, keeping his residence and the investigation scene connected; His old friend Fuyufumi Aoki belongs to another faction, known as the "Death Wrist." As the investigation progresses, the police, theater troupe, and school members gradually unite into the same case.
Narrative and operation
The main storyline changes the characters' fate through choices. When switching to other characters' perspectives, the scene is arranged in a vertical novel format, adding things Qiu Wu does not yet know. The Switch version offers read redirects, reverting from message history, rewinding read, and up to 200 save locations, with independent adjustment of touchscreen and character voice settings.
Included in the edition
This title was released on Switch on February 5, 2026, based on the 2023 REBIRTH FHD SIZE EDITION, and includes the 2005 main story and the epilogue 'Sakurament,' originally included in the 2007 'Kami Hako'. The three texts in Japanese, English, and Simplified Chinese are paired with full Japanese audio, and the protagonist also has voice acting. The limited edition also includes an epilogue and an art book.
Production and songs
The original artwork was handled by Sugina Mizuki, with script credits to Miya Suzuka and original scriptwriter Kazuhiko Iida, and music by MANYO. The opening theme "Koiku" is performed by Haruka Shimotsuki, with lyrics by Rokuurakan and music by MANIO, with Haruka Shimotsuki and Marie providing backing vocals.
The connection between the academy and the theater troupe
Qiqi and Louzi are classmates; Kaoru Fukami teaches at their Catholic academy. Wana pursued a career in the stage, while Ikuma Akao was the art director of his theater troupe, and he had a workshop at home. The schools and theater troupes involved in the case therefore have direct contact with Qiu Wu's relatives and friends.
Yura's isolation and obsession
Yura was isolated by her family as a child, and Shugo's acceptance became an important early social connection. After parting ways with Qiu Wu, she experiences research facilities and the life of being revered as the cult leader; Her obsession with Shugo is accompanied by her fear of loneliness and being abandoned, and also involves her conflicts with her twin sister Kazuna.
The family outcome of the Switch post-story story
Sacramento continues the endings of different characters. Wana's True End shows that she and Akigo are already married and have a daughter; Yura's "Umi no Hikari" revolves around trusting Akigo and accepting children, ending with a focus on his daughter's future.
Source: Structured works maintained by the Bangumi community, filtered and rearranged by this site.
Related entries
- Characters:Shugo Takagi (Koigoku)
- Characters:Yura Kamizuki (Koiyu)
- Characters:Kazuna Kazuki (Koiku)
- Characters:Takashiro Qiqi (Love in Prison)
- Characters:Fuyushi Aoki (Koiku)
- Characters:Hatsune (Koiku)
- Characters:Rin (Koiku)
- Characters:Rain Sparrow (Love in Prison)
- Characters:Yiyu (Love in Prison)
- Characters:Rouko Ayazaki (Koigoku)
- Characters:Kaoru Fukami (Koiku)
- Characters:Shicao Shizi (Love in Prison)
- Characters:Kazuma Arishima (Koigoku)
- Characters:Ichi Yaginuma (Koigoku)
- Characters:Akao Ikuma (Koiku)
- Story Setting:Snow White (Love in Prison)
- Story Setting:Death Arm (Love in Prison)
- Key Animation:Sugi Na Mizuhime
- Screenplay:Miya Suzuka
- Original script:Kazuhiko Iida
- Soundtrack; Composer of 'Love Prison':MANYO
- Related songs:Love's Prison (Love)
- Performed 'Love in Prison'; Harmony:The frosty moon stretches far away
- Lyrics by 'Love in the Prison':Liupu Hall
- "Love Prison" Harmony:Marie
- Characters:Keiichiro Kozuki (Koigoku~Moon Madness~)
- Setting and Setting:Qiqi's Catholic Academy
- Setting and Setting:The theater troupe to which He Cai belongs
- Included chapters:サクラメント True End
- Included chapters:Sea light
References
- Bangumi work entry: Cartagra
- Bangumi Copyright Notice
- PROTOTYPE: Love Prison Switch version
- 11 Monsters: Kartagra Switch Version Impressions
Source author: Bangumi article contributor and community maintainer; License: CC BY-SA 3.0 (https://creativecommons.org/licenses/by-sa/3.0/); Adaptation: This site filters and reorganizes structured facts, without copying the article summary.
Data compiled on: 2026-10-07.