Based on the CG collection by Maron☆Maron (まろん☆まろん). The protagonist who has difficulty to interact with women because of bullying returns to his younger time as he has wished for a long time. He takes revenge by sexually assaulting Sera and her mother next door. However, he is not yet satisfied... (Source: DLsite English) Note: A live-action AV adaptation (MIMK-050) was released on October 7th, 2017.