Suzu is a robot that has been implanted with the memories of a boy named Ryo Ogura. He was created at the request of the deceased Ryo’s parents to replace him, and the memories are presently being embedded in him. Then one day, Suzu meets a girl who is suffering from a disease which is causing her to lose her memory. Her circumstances are completely the opposite of his as his memory data of Ryo is continually increasing, but the bond between them deepens.