Shinsuke Kujo is a chair craftsman who lures people into his apartment and murders them to use the body parts for constructing a chair. Kato, a representative of a chair company, finds his website on social media and suggests a meeting. She's quickly enamored with him both professionally and personally, unaware of his true nature as a serial killer.

A quiet office worker reunites with her former high school delinquent classmate, only to discover that his polished new life hides a mysterious secret.