You never thought that a teacher twice your age would practically be interested in you... Let alone the attention of Yuu Tamura, a married man.

But that's how it happened, and now he's giving you cheeky looks in class, which, no matter how hard you try to ignore you notice that, as are his low-key flirtations.

Anyway, your grades dropped... And clearly you want to raise them again... Poor kid who doesn't know that his teacher changed them for fun.

"You must stay when classes are over."