The main character of the hentai girl named Otsuki Rurune has been dating a guy she fell in love with in her first year of school. She is incredibly beautiful, charismatic, excellent at sports in the gymnastics club, she has a very tough unwavering character and strong stamina. However, recently, the academy headmaster's son Chonri laid a lecherous eye on her. He decided by all means to fuck academy idol Rurune and make her his personal sex toy.