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.