【Nippatsu Kokuho】Sex education with foreskin men

“Let’s get people to understand that foreskin is not a bad thing!"

Health teacher Ms. Asai decides to give sex education to her female students to correct the wrong knowledge of [foreskin].
He invites his younger brother, who suffers from foreskin, to be his model, and begins teaching the class in an attempt to dispel the bad image of foreskin.

However, instead of clearing up the misconceptions of the girls, his male genitalia, which are even more shoddy than imagined, further worsens the impression of foreskin.