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Shueisha Games has released a trial version of The Season of Books and Keys, a PC adventure game built on Honobu Yonezawa's novel. The trial covers Chapter 1, "913," in which library committee members Jiro Horikawa and Shimon Matsukura take on a safe left behind by their deceased grandfather. iMel handles development, with mystery design by Nozomu Unabara of Liar-soft. The full version is scheduled for this winter, price undecided.
Shueisha Games released a Steam demo for the adventure game Hon to Kagi no Kisetsu on October 20, 2026, the opening day of Steam Next Fest. The demo contains all of Chapter 1, titled "913." Developer iMel is handling the game, which is planned for release this winter on Nintendo Switch and Steam. Hon to Kagi no Kisetsu adapts Honobu Yonezawa's novel of the same name, published by Shueisha Bunko. It follows Jiro Horikawa and Shimon Matsukura, two high school boys on the library committee who take on mysteries that arrive in their ordinary lives. In Chapter 1, senior student Mari Uragami asks the pair to open an "unopenable safe" left behind by her late grandfather, and the grandfather's words serve as the clue. The game uses illustrations and full voice acting throughout, and in some scenes the player solves the mystery directly as Horikawa. Kazuki Ura voices Horikawa, Yuichiro Umehara voices Matsukura, and Arisa Sakuraba voices Uragami.
Shueisha Games and developer iMel announced a video game adaptation of Honobu Yonezawa's mystery novel Seasons of Books and Keys for Nintendo Switch and PC via Steam, launching in winter 2026. The fully voiced game stars Kazuki Ura and Yūichirō Umehara, features an original episode by Yonezawa, and supports Japanese, English, Traditional Chinese, and Simplified Chinese subtitles.