I am currently a student at a prep school who has failed the entrance exam twice. I tried to pass the exam on my own but failed, so I moved to Tokyo and started living in a boarding house. There is an unspoken rule in this boarding house that only those selected by the manager, Auntie Michika, can participate in the special late-night classes. Only those who attend know the contents of the classes, but just imagining being alone with busty Auntie Michika makes me want to get a nosebleed. However, on my first day living in the boarding house, contrary to my imagination, I heard groans coming from the room where the classes were taking place...