Sachiko, a super tutor with a top-class pass record in Tokyo. However, she has the fatal flaw that she can't stop provoking dirty words when she sees an adolescent boy who is erotic and beautiful, so her monthly fee is cheap. A virgin boy who suffers from being given such a strong sexual harassment tutor by his parents. No matter how many times she whispered obscene words in her ear, showed her lingerie and boobs, and jerked and sucked her cock, she endured it all in order to pass a prestigious university...
