Karen has been holed up in her house for some time, a NEET. She spends her days engrossed in video games in her messy room. Worried about her, her father hires a tutor to help her study and get back into society. At first, Karen doesn't open up to the tutor at all, but after he teaches her how to beat a game, she begins to like him. Karen, who has always had an extreme personality, wants to have a physical relationship with the man and tries to force the act. The man, who is newly married and loves his wife, resists, but gradually they begin to share pleasure thanks to Karen's techniques...