Ria, a girl who became a shut-in after the death of her parents. Her only best friend also decided to move abroad... When she was about to fall into the depths of despair because she was going to be alone... she was told that there was a custom-made bionic robot. She asked for a robot that looks like her best friend's brother, whom she had been interested in as a member of the opposite sex... Ria, who drowns in sex every day and becomes dependent on it. However, the robot... "Ria... actually... I'm going to be recovered..." The shut-in girl who knew a piece of happiness tries to face despair...