The limited-time event "The Light of Vows" is currently being held in "Alpla," a walk-through real-world experience app that combines location information and augmented reality.
This event is a collaboration with the mystery novel series "Kaga Kyoichiro Series" (written by Keigo Higashino), and Detective Kaga Kyoichiro will appear in an original story within the app.
The setting is Nihonbashi.
Enjoy an immersive experience where the real-world cityscape and the story are linked, and new clues are discovered with every step you take.

"Novel x Game x Nihonbashi"
Please come and experience a new Nihonbashi experience.


◼︎Event Overview
Title: An Experiential Mystery Around Nihonbashi- The Light of Vows -
Period: April 27, 2026 (Mon) - March 30, 2027 (Tue) (tentative)
*The event period may be subject to change.
Location: Nihonbashi area (Chuo Ward, Tokyo)
Content: An interactive mystery event using the AR app "Alpra".
*During the event period, you can experience it at your own pace.
Special website: https://lp.arplat.jp/chikai/
Special movie: https://www.youtube.com/watch?v=WW8q5WRjj4A

To participate in the event, you need to install the AR app "Alpra" on your smartphone. Please download it from the link below.
iOS: https://apps.apple.com/jp/app/id6463716168
Android: https://play.google.com/store/apps/details?id=com.dena.a12027123