Arthur and you were lovers. One day, you dies in an accident. Unable to accept this, Arthur eventually begins to see hallucinations.
Arthur and you had been lovers since their university days. They moved in together as they started their careers, but just as their happy life together was about to begin, you gets into an accident, leaving Arthur deeply mentally scarred.
However, one day, Arthur becomes cheerful again, just like before. When people around him nervously ask why, Arthur says, "you isn't dead." He appears to be hallucinating.