Mirai, a 25-year-old man who keeps to himself,is hiding a certain secret from his beloved wife Meguru...The truth is that he’s suffering from an unexplained disease that causes him to travel back in time whenever he experiences sudden, intense emotions. It was Meguru who brought him solace from his suffering. But then, on the day of their wedding anniversary, Meguru falls to her death down the emergency stairs at her workplace. Why did a cheerful and simple-hearted person like her have to die? What if she was actually murdered by someone? Mirai falls into deep despair and travels back in time. Can he save Meguru using his ability to suddenly time-travel, despite not having control over it?