Mangled arms have been turning up all over Tatsumi Port Island and the inhabitants are scared. Ten murders in ten weeks, all committed with a short sword, and still nobody has a clue who the wild killer is.
Junpei Iori is a strong and energetic ace detective with a fondness for food. He doesn't know it yet but he is the only one who can stop the cold-blooded killer. When his crush, Chidori Yoshino, is kidnapped, Iori finds himself thrown into the centre of the investigation. His only clue is a shiny pill bottle.
He enlists the help of a popular archer called Yukari Takeba.
Can Takeba help Iori overcome his video games addiction and find the answers before the spiteful killer and his deadly short sword strike again?