The tutor's sister is an excellent tutor who has improved the grades of many students. However, she is actually a dick and likes co-mo. She hides her propensity and proceeds with the class, but she is tossed by the mischief of the mischievous "Hajime-kun" and the bug of Shi*tacon aches. And she, she finally put her reason in! The older sister whose self-control has collapsed transforms into erotic.
