​Join Reiji, a private detective, as he is approached by a mysterious girl with a plea to find her true self. As he takes on the case, a series of bizarre murders unfolds, and Reiji is tasked with investigating the incidents. Meanwhile, his younger sister attends a prestigious all-girls high school where two students have gone missing. The vice principal, Tokio, asks Reiji to search for the missing girls, adding to his workload. To gather information, Reiji infiltrates the school and encounters Toko, who had previously asked him to find her true self. As the killings continue, Reiji finds himself caught in a tragic web of events. Can a girl’s smile be the key to breaking the cycle of despair?​