[NippatsuKokuhou (Kaneko Ken)] Sex education using foreskin boy

A well-meaning health lesson turns into a nightmare when a teacher strips her phimosis-afflicted student naked and presents him to the class as a living anatomy diagram. Surrounded by giggling classmates who pick apart everything from his unwashed foreskin to his suspected virginity, the blushing boy endures a hands-on demonstration, merciless small-penis mockery, and questions nobody should have to answer in front of a crowd. When the humiliation follows him out onto the street afterward, one classmate's lingering curiosity hints the lesson might not be quite over.