Kyouhan

Sousuke Yamamoto, son of the priest, has been having a hard time with his family. Not only is he troubled at home, but at school too. Mainly in regards to Reina Shiratori, heiress of the largest company on the island and most popular girl in class. She and her friends torment Sousuke, forcing him to lick Reina's feet in the girls bathroom. This leads to a stirring within Sousuke...

(Source: Kadokawa, translated)