One day, as Ikuro is organizing the hotel guest lists, an elderly man claiming to be a regular arrives. His name is Atsuhiko Suzumura and he last stayed at the hotel twenty years ago. Confused, Ikuro takes his bags and realizes that he has dementia. As Ikuro and Sara take Atsuhiko back to his daughter, Hazuki, he starts telling old stories about his past as a contract killer and his daughter.