Level 7

An elderly person who lives alone is shot to death in his home. Detective Inuyama and other detectives go to the crime scene. There, they learn that the elderly person's 50 million yen that was hidden is now gone. Meanwhile, a man wakes up in the same apartment complex in Tokyo. He has lost his memory completely. He can't even remember who he is. The man sees the words "Level 7" tattooed on his wrist.