At night, Yui, a musician, meets Jun-ichi, an improvising actor, on the riverside square where young people are performing on the street. They argue with each other over their "stage". Jun-ichi intervenes in a fight one day, but is knocked down. Yui shows up and drives him to the hospital. Their are attracted each other, but then Jun-ichi gradually starts acting weird and then he disappeared. After two years of searching for Jun-ichi, Yui receives a letter from a person who claims to have Jun-ichi 's memories in custody. After visiting and watching the "Film of Memories," Yui learns about the secret that Jun-ichi has been keeping from her.