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Return to Blue Whale Island

"Return to Shironagas Island" is a remote island mystery adventure planned and produced by Onimushi Hyogo. New York detective Sen Ikeda receives an invitation to the island left by a wealthy man's will, and takes along a girl named Neneko Izumozaki, who possesses special abilities, to investigate murder cases and uncover secrets. The Steam version was developed by ONIMUSHI Hyogo and published by TABINOMICHI, released in 2020.

Work information
Title of the workReturn to Sironagas Island
Chinese nameReturn to Blue Whale Island
The publication date listed in the materials2018-12-30
PlatformNintendo Switch / PC
Genreミステリーアドベンチャー
Also known asReturn to Shironagasu Island
DevelopmentOnishi Hyogo
ScriptOnishi Hyogo
Key animationOnishi Hyogo
MusicShingo Kataoka
Website address recorded by the sourcehttp://shironagasu.tabinomichi.com/
External links to source recordshttps://erogamescape.org/~ap2/ero/toukei_kaiseki/game.php?game=27632 / https://vndb.org/v25413 / https://www.dlsite.com/maniax/work/=/product_id/RJ01026406.html / https://store.steampowered.com/app/1156990/

Source: Structured works maintained by the Bangumi community, filtered and rearranged by this site.

A wealthy man's letter and a lonely island

The story begins with an invitation letter to Shironagas Island left behind in a tycoon's will. Sen Ikeda, who runs a detective agency in New York, and a girl named Neneko Izumozaki, who possesses special abilities, set out to the island; Upon arrival, bizarre murders occur one after another. The investigation subjects included not only the case itself, but also why the island was named in the suicide note and the truth hidden on the island.

Detective and assistant

Sen Ikeda is an experienced detective, and Neneko accompanies him as his assistant. The two have different abilities and observational methods, and their partnership provides the main perspective for the island's investigation. The official summary only states that Neneko has special abilities and does not reveal her specific boundaries on the introduction page; Other invitees on the island connect with the case, gradually forming a collective image of confined space reasoning.

Survey objectives and game formats

The work is positioned as an island mystery adventure and visual novel. Players follow Sen Ikeda and Neneko to investigate a series of murders, uncover the island's hidden secrets, and search for a way out of danger. The story connects the island's invited guests and multiple mysterious cases through the perspectives of a detective and his assistant.

Production and platforming

Planning and production were handled by Onimushi Hyogo. The Steam product page lists ONIMUSHI Hyogo as the developer and TABINOMICHI as the publisher, released on March 2, 2020; The official TABINOMICHI website lists platforms as Windows, Nintendo Switch, and iPad. The Steam page contains Japanese audio and Chinese Simplified text.

Residents and staff on the island

Besides Ikeda Sen and his assistant Neneko Izumozaki, the island also features wealthy girls like Ada Higgins, Akira Edgeworth, and Dr. Lil Bexter. Gisele Reed is Akira's maid; Abigail Ellison and Vincent Swift are Louis Asochet's maid and housekeeper, respectively. The employment relationships of the characters and the actions of the detectives form the investigative backdrop.

Porting and derivative voices

The Steam version was released on March 2, 2020, and the Switch version on November 17, 2022. The radio drama "Shojo-tatsu no Desire Battle" is written by Onimushi Hyogo with four stories, plus an approximately 75-minute episode called "Shoujo-tatsu's Dotabata Soudou." The novel illustrations are by Shiroi, the manga version is illustrated by Muratan, and the first volume will be released in September 2026.

Original soundtrack included

Game soundtracks, currently listed with 46 tracks. The introduction still lists 45 tracks, with differences in counting between the two sections. The artist section is credited to Shingo Kataoka, while other credits include geoffpeters and Snowflake from The Key, as well as A. Adam、P. Tchaikovsky。

Early fan releases

Before the original "Return to Blue Whale Island" was completed, Hyogo participated in doujin fairs with a demo version, referencing commercial game packaging and major club booths to ensure the low-priced product still had a complete appearance. Since then, he has continued releasing demo and phase versions, and in his 2021 IDC talk, he noted that these early deliveries help build awareness for the Steam full release.

Source: Structured works maintained by the Bangumi community, filtered and rearranged by this site.

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References

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: 2026-10-10.

本版编辑：免费机器翻译 · 2026-10-22

内容许可：CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/

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