Monami is a busty girl with a plain appearance who has no opportunities for sex and only fantasizes about perverts. Just like her appearance, she is also quiet and timid. She has a plain job, working at a library and has only had one sexual experience with a man... But she has always had a sexual desire to be messed up by a man. By chance, she finds out about a "pervert club" on social media. This is a work that documents her transformation into a lewd one as she exposes her plain sexual tendencies.