"This is your new mother, Chisato. Let's get along well from today onwards." His father remarried to the unexpected wife of his first love, the nurse Chisato. Chisato had been kindly taking care of Taro since he was a child and was constantly in and out of the hospital, and she was Kokoro support. As he entered adolescence, he couldn't count the number of times he had masturbated to Chisato. But from today onwards, Chisato, whom he loved so much, would become a part of his family as his mother. This love ended without him even being able to confess his feelings. Unable to give up, Taro gave in to his emotions and approached Chisato...