Dripping Wet Academy Harem -Accidentally Getting Lucky With Girls-

"I CAN'T TAKE IT, TEACHER! IT'S TOO BIG!" KENGO SAKAMAKI goes back to his hometown for student teaching practice. And there, he finds out his alma mater that used to be a boys' school has become a girls' school. The students there are all NAUGHTY!! The student council president masturbates with a vibrator, students go into the men's bath, and what's more, some girl begged him to show her his dick! KENGO teaches his students a lesson with his big cock. So begins KENGO's harem life at the girls' school!

(Source: Coolmic)

Note: Simultaneously released in long-strip and traditional formats, with 40 episodes and 10 chapters respectively.