10000-ningiri no Mahoutsukai

Walpurgis Magic Academy, a place ruled by spirits possessing overwhelming magic and libido. These arrogant, beautiful spirit girls look down on humans, boasting, "There's no way a human man could ever satisfy us♡" Into this academy steps a transferred wizard. His sole weapon? An out-of-this-world, boundless stamina and sexual power that makes even spirits tremble! Using his overwhelming prowess, he teaches these proud and beautiful spirit girls a lesson, one after another...?!

(Source: Kodansha, translated)