"Are you crying? There's tears welling up." "Hey! Get your hands off! Who do you think you are? Are you crazy? Just mind your own business and go on your way!" I was introduced to the annoying girl I met on the street as my new private lesson teacher. Y tried to act fierce as usual, thinking of chasing her away, but she was different from any teacher I had met before. "Ah... Why is the door like this?" "The door won't open. I locked it." A brat who's cocky, arrogant, but also scared. Watching Y's anxious, trembling eyes, she thought to herself that the process of taming someone with such pride would be quite enjoyable. "...Why, um, why?" "I just wanted to play with you a bit. That's why I'm here." And thus, a completely different kind of education begins for Y...