A collection of two Japanese detective mystery adventures, originally released for feature phones, brought to Nintendo Switch as part of the G-MODE Archives+ series. The collection includes Kohakuiro no Yuigon and its follow-up story, Kyomou no Mukui: Kohakuiro no Yuigon Tsuiho-hen. Set in Japan during the Taisho era, the story follows private detective Ryunosuke Todo as he investigates the poisoning of wealthy merchant Kotaro Kageya. A set of tarot cards left behind as a mysterious testament becomes the central clue in a series of murders at the Kohakukan mansion. Players investigate locations, question suspects, collect evidence, and unravel the complicated relationships surrounding the Kageya family.