In 2009, a young girl named Saki Sakura (played by Kyoko Yoshine) was brutally murdered, which made her sister Reina (played by Keiko Kitagawa) miserable. Before the murder, Sakura secretly moved to her relative's house to avoid the harassment of the stalker, but a bad detective was asked by the stalker to find the girl's current residence, which triggered a bloody tragedy. In order to find out this detective called "Death", Reina worshipped Yasuomi Suma (played by Arata Iura) and asked for detective training. For some purpose, Suma not only finally agreed to Reina's request, but also set up an "anti-detective class" for her. When investigating a case, Reina met the cold and well-known detective Abiru (played by Yusuke Nakayama), who seemed to be an important person involved in the murder of her sister. And the new member Minemori Kotoha (played by Haruna Kawaguchi) assigned to the anti-detective class by Suma has a close relationship with Reina... This film is adapted from the original work of the same name by Keisuke Matsuoka.