Wataru failed the university entrance exam and is currently retaking it for the second time. Unable to bear the sight, his father asks his colleague's wife, Kanako, to be his tutor. Kanako immediately starts teaching him, but Wataru is dazzled by her body and is unable to concentrate on his studies. He even plays naughty pranks on her during breaks in class. In the end, he purposely soils Kanako's clothes, puts her in the bath, and hands her a micro bikini, saying she needs a change of clothes.