Wataru, who failed his university entrance exams and is repeating the year. His father, unable to bear it any longer, asks a colleague's wife, Kanako, to be Wataru's tutor. Kanako immediately starts teaching him, but Wataru can't concentrate on his studies because he's distracted by her body. He keeps pulling lewd pranks during their lessons. Eventually, he deliberately soils Kanako's clothes and sends her to take a bath, handing her a micro bikini under the pretext of changing clothes.
