THE EROTICAL WIZARD AND HIS TWELVE BRIDES

Junpei Ichinose, a first-year student in the National Magic Academy’s high school, is a total failure! Though he dreams of one day becoming a wizard, he can’t cast so much as a single spell. One day, the self-proclaimed great mage Meryl appears before him, searching for the Ring of Domination. Meryl detects that Junpei has a latent talent for…erotic magic! But what exactly is erotic magic?! There’s only one way to find out! (Source: Seven Seas Entertainment) — Description from AniList community (anilist.co).