The "Holmes Detective Agency" is facing the crisis of bankruptcy, with only two employees left: rookie detective Ryosuke Noda (played by Tsuyoshi Morita) and assistant Kyoko Demizu (played by Minori Ichikawa). One day, they received a notice from their boss, claiming that a new detective was hired to rectify the detective agency. Unexpectedly, the mysterious man Takano Seiya (played by Higashiyama Noriyuki) who showed up carrying environmentally friendly chopsticks and eating an astonishing amount of food appeared. Not only did he eat up all the remaining assets of the detective agency, he even took the sushi from the murder scene and swept it all into his stomach. However, after tasting these evidences, Takano will deduce the answer to the case from some characteristics and conditions of the food.