My friend's wife is a lewd private tutor

I failed my university entrance exam and am now a two-year-old student. Unable to be awaited, the father asks his colleague's wife, Kanako, to become a private tutor. Kanako immediately taught her how to study, but Wataru was blinded by her body and couldn't concentrate on her studies. He keeps playing naughty pranks in between classes. In the end, he deliberately stains these clothes, puts them in the bath, calls them a change of clothes, and hands them a micro bikini.