Fu Yoshizawa is a young man with selective mutism who is unable to speak in certain social situations. He can only speak to his mother at home. A young woman, Shiori, starts working in an accessible workplace for people with mental disabilities where Fu also works at. She tries to talk to him, but he is unable to respond. One day, Fu is in the forest collecting cicada’s shells, as he often likes to do. He suddenly hears footsteps from a distance and slowly walks towards the sound…