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 Karen , her father hires a tutor to help her study and get back into society. At first, Karen doesn't open Kokoro to the tutor, but he teaches her how to beat a game and she starts to like him. Karen has always had an extreme personality, and wants to have a physical relationship with the man, so she tries to force herself on him. The man, who is newly married and loves his wife, resists, but gradually they begin to share pleasure thanks to Karen's techniques...