Ending Theme 'Silen to' by Riko Sasaki from 'Someone's Game Cartridge' Now Available on Streaming Services

Fourth Boundary, the creator of 'Someone's Wallet' and 'Mirror's Special Juvenile Rehabilitation Facility', has announced that the ending theme 'Silen to' for their latest ARG 'Someone's Game Cartridge' began distribution on major music streaming services on June 5th.

'Silen to', inspired by the story woven by 'Someone's Game Cartridge', is a song with lyrics written around the theme of 'precious memories and hidden messages with a friend who changed me'.

The singer is Riko Sasaki, who is actively working as both a singer and voice actor. The composition and arrangement were handled by Shotaro Seo of MONACA. This gem of a ballad adorns the finale of 'Someone's Game Cartridge', which depicts an epic story starting from someone's save data.

Song Release Information

Song Title: Silen to

Artist: Riko Sasaki

Distribution Start Date: June 5, 2026

Lyrics: Yuki Kawano

Composition & Arrangement: Shotaro Seo (MONACA)

Distribution Link: https://linkco.re/Q2UqXP7v

Song Credits

Recording & Mixing Engineer: Hiromitsu Takasu (VICTOR STUDIO)

Assistant Engineer: Kanta Sato (VICTOR STUDIO), Shinya Nomachi (VICTOR STUDIO), Shuka Kurihara (VICTOR STUDIO)

Vocal Recording Engineer: Yuka Ogawa (Redefine)

Electric Bass: Shigeki Ichimoto

Electric Guitar: Sho Horisaki

Drums: Ken Higebiro

All Other Instruments & Programming: Shotaro Seo (MONACA)

Produce: Yuri Misumi (MONACA)

Recording Studio: Victor Studio, Splash Sound Studio

Mixing Studio: Victor Studio

Mastering Engineer: Rena Koyanagi (form THE MASTER)

Mastering Studio: form THE MASTER

Special Thanks: Tsutomu Satomi (Shangri-la Inc.), Shibo Igarashi (VICTOR STUDIO), Miho Handa (Redefine), Natsuho Ota (form THE MASTER)

Someone's Game Cartridge

Currently, orders for 'Someone's Game Cartridge' have been flooding in since its announcement, and pre-orders are now being accepted for delivery in late July to August.

The game's name is 'With the Eternal Light'. It is a mysterious adventure game for a game console called PLAYGATE.

To conquer 'With the Eternal Light', information existing on the internet is required, and players will navigate between the web and the game to uncover the truth hidden within this game, and the light.

<PV: https://youtu.be/EQ4XQRvPEz8>

You can play this game from the beginning or continue from a saved point. However, this game is not ordinary. Because no one has ever cleared this game yet. Please be careful of the hidden light and clear this game.

This work is fiction, so the PLAYGAME console does not exist, but the official website is real, and 'With the Eternal Light' was reportedly spotted for sale at the used game shop 'BEEP' in Akihabara, Tokyo, becoming a topic of conversation.

This game cartridge has been specially modified with an added NFC chip, allowing you to actually launch 'With the Eternal Light' from a PC or smartphone browser.

This work is an ARG (Alternate Reality Game) that begins with someone's game cartridge.

The price of 'Someone's Game Cartridge' is 7,150 yen (tax included). It is available for purchase at the Fourth Boundary online shop and other locations.

Main Staff

・Director: Manami Imaizumi (Someone's Wallet, Isobutsu-ten, Non-Reson, etc.)

・Character Design: Waboku

・Product Design: Richard Falcema

・Singer: Riko Sasaki

・BGM: Shotaro Seo (MONACA)

Fourth Boundary

Fourth Boundary is a creative group that weaves stories in the ambiguous realm between reality and virtuality.

・Official Website: https://www.daiyonkyokai.net/

・X: https://x.com/daiyonkyokai

・Store: https://shop.daiyonkyokai.net/

・Discord: https://discord.com/invite/CgmPzZuVSf

・note: https://note.com/daiyonkyokai/