This hentai is based on the manga of the same name by Monorino, which is set in the year 2024. The protagonist of this hentai is a student named Etu. He has long been in love with his classmate Sayako, who is very popular with the boys. One day Etu witnesses Sayako being attacked and immediately decides to save her. Once they are safe, the hero discovers that the girl’s mask of innocence hides a very different personality.  In fact, Sayako has a split personality, and during the day she is kind and modest, but at night she turns into a passionate, lustful bitch. When they’re alone together, Sayako fucks fat Eta hard.