The plot of the game focuses on Kazuki, a person orphaned as a child due to an accident. After graduating from the police academy, he was recruited by a non-governmental organization that investigates murders the police deem are impossible to solve. Kazuki’s partners include the crazy and funny Ishikawa siblings, Kaoru Moriyama (the daughter of a millionaire and founder of the organization), and Suzumi Misao, the head of the organization. With a delightfully quirky cast, players will form bonds with the main characters while trying to solve the overarching case of the Phantom Killer, a criminal with a perfect track record.