Young Nagano Jun (Guili and also acted the role of), a young man with a photographer's dream, is an employee of a home appliance mall, and he seems to be an unlikable person both in the workplace and at home. On this day, Nagano, who was eating at a fast food restaurant, secretly took the mobile phone of a white-collar employee sitting next to him, and then cheated money from his mother by pretending to be a man named Dashu. But it was strange that it happened soon. Dashu's mother really regarded Nagano as her son, while Nagano was driven out of the door by her mother as a stranger. The man who lives with his mother is a man who calls himself Dashu but is exactly the same as Nagano. Soon, a college student named Ah Zhi appeared, and he also had the same face as Nagano. The three Nagano get together, the same thinking and hobbies let them feel more relaxed than ever before, they take advantage of this convenience to get a lot of benefits, but as the "Nagano" people continue to multiply, the killing also follows …... This film is based on Chiyuki Hoshino's novel of the same name.