since the age of 7, he has been suffering from a split personality due to childhood psychological trauma. when he was 7 years old, he was kidnapped and held hostage for 5 days, cruelly mocking him. the kidnappers wanted a ransom for him.was saved by a detective. His second identity is called Naito.The detective often turns to a personal psychologist for help, deciding how to get rid of his second personality Naito.hides his split personality from everyone