Puri Puri (2005)

Blurb:
All he ever hoped for was to be one step closer to becoming a priest, but Masato Kamioda gets more than he bargained for when he suddenly finds himself as the only male student in a pilot program at an all-girls divinity school. As he soon discovers, divine guidance will be his only salvation if he is to withstand various efforts to get him expelled and numerous cruel pranks that test the limits of his ability to keep his passions and desires under control. Can a boy’s determination to graduate to the priesthood truly contend with the decadent temptations only a school brimming with young beauties, sexual frustration, and the lure of white lace can offer?

Source: www.anisearch.com/manga/501