Kazuma Hiakane has lost his memory. I know her name by her name tag on her chest. However, he was found at the site of an unknown hospital fire. Kazuma is marked as a suspect by the police, but heads to the hospital for clues on his memory. His memories he regains like a flashback, he remembers himself as Knockers. However, when Kazuma remembers the tragic incident at the hospital, Knockers appears who calls his name!