There's only one week left until Ai's parents' house, which had been vacant for a long time, will be demolished after her parents have passed away. Ai visits his girlfriend's parents' house for the first time in a while to organize and clean the household goods. She discovers her erotic novels that she had read during her school days in her room, and her love indulges in masturbation as she travels back in time to those days when she was young. Then, there was a sign of someone in the empty house, which was supposed to be empty! I can't hide my surprise