Ishigami comes home from work and discovers his wife dead. Just then, he receives a phone call from his wife and falls in utter confusion. Suddenly, two strangers claiming to be the police barge in. Ishigami gets accused as a murderer and ends up going on the run. In order to get to the truth, Ishigami goes to his wife’s mother’s house. However, other people have long been residing there with no trace of his wife to be found. Escaping from the strangers after him, Ishigami continues on and struggles to find his wife who had vanished. Along the way, Ishigami starts losing his memory and finds himself acting like someone else. What is his true identity?