Stray Children Treasure Box Edition Launches December 10 With Art Book, Lost RPG Music CD
The Treasure Box makes a tangible artifact out of a fictional game that only existed as lore, treating a canceled RPG as a real lost work fans can now hold.
Key Facts
- "Stray Children TREASURE BOX" releases on December 10, 2026, for Nintendo Switch at 10,978 yen.
- The box is a first-print limited edition produced only for pre-orders; no additional manufacturing will follow.
- The set includes the game cartridge, a 160-page development archive "Stray Book," a music CD for the fictional RPG "Mikazuki," a cloth map, and an acrylic keychain.
- The music CD features chiptune compositions by Thelonious Monkeys, with a booklet of pixel-art game screens.
- Pre-orders opened on July 24, 2026.
Reporting from 2 sources: GAME Watch (Impress), 4Gamer.net.
Onion Games has announced a premium physical edition of its RPG "Stray Children" for Nintendo Switch, set for release on December 10, 2026, at 10,978 yen. The "Stray Children TREASURE BOX" is a limited first-print run produced only for pre-orders, with no additional manufacturing planned after the order period ends. The box includes the game cartridge with all updates applied, the "Stray Book" development archive spanning approximately 160 pages of sketches and setting art by character designer Kazuyuki Kurashima, background artist Satoshi Katsuta, and director Yoshiro Kimura. Also included is an experience music CD for the in-game fictional RPG "Mikazuki," described in the game as a title canceled in 1997, featuring chiptune music by the group Thelonious Monkeys. A cloth antique map titled "The Night Before the World's Collapse" and an acrylic keychain featuring the protagonist and his companion complete the set. Pre-orders opened on July 24. A talk show to commemorate the announcement is scheduled for July 25 at 20:30 JST on Kimura's X account, featuring Kimura, Kurashima, and Thelonious Monkeys members Masanori Adachi and Hiroshi Taniguchi, hosted by Yamaguchi Quest.
The Treasure Box edition builds on the original December 2024 Switch release of "Stray Children," an anti-RPG by the team behind the cult classic "moon." The game follows a boy who falls into an RPG world and travels through a country of children hiding from monster-like adults. Director Yoshiro Kimura described the development process in a companion interview published the same day, revealing the team spent a full year on background art design with Katsuta and Kurashima, and that the initial Switch version launched with many bugs that were later patched. Kimura said the game was designed to communicate that "you don't have to play perfectly" and that it is okay to live without scoring 100 percent. The music CD for the fictional RPG "Mikazuki" uses chiptune compositions, and the included booklet reproduces pixel-art game screens. The cloth map shows the world of "Mikazuki" as it connects to the "Stray Children" story. Pre-orders are available at Amazon with or without an unspecified bonus item.
- Nintendo Switch Software "Stray Children": game cartridge with all updates applied
- Development Archive "Stray Book": approximately 160 pages of sketches and setting art by Kazuyuki Kurashima, Satoshi Katsuta, and Yoshiro Kimura
- Experience Music CD "Mikazuki": chiptune mini-album by Thelonious Monkeys for the fictional canceled RPG, with booklet featuring pixel-art game screens
- Cloth Antique Map "The Night Before the World's Collapse": A3-size map of the "Mikazuki" world
- Acrylic Keychain "Tomodachi": features the protagonist Nanashi no Kodomo and companion Kenken
Synthesized by Yomimono from the 2 cited sources below, including Japanese-language reporting where cited, then editorially reviewed before publishing.