Action actor Tateishi Daisuke who struggles with loneliness after suffering a traumatic experience due to an accident during filming. One day, he comes across a senior high school girl Ayumi who is being harassed consistently by Chinese brokers and the local yakuza. He decides to protect her from them. However, after this incident, he comes to develop a mindset of seeing violence as a way to gain the affirmation and approval of others thus gradually loses himself and behaves in an extreme manner.

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.