Saigo no Eiyuu ni Sasagu Hanayome Gakuen Toki wo Koeshishi Mahoutsukai, Jidai no Hime to Kizuna wo Musubi Harem wo Kizuku

Alec, the strongest mage, has become so powerful that he finds the peaceful world he created as a hero incredibly boring. Believing he might encounter a worthy rival in the future, Alec decides to sleep for three hundred years… but… When he awakens, Alec finds himself enrolled in what's called the "Bride Academy"—an institution dedicated to cultivating suitable partners for him. Confused by this unexpected turn of events, Alec nonetheless recognizes the genuine strength of the "Princesses," the next generation of female mages attending the academy. In response, Alex declares that he will also attend the academy—!? A unique harem fantasy begins within this magical academy where every student is a potential bride, a story of an unparalleled hero who is completely unfamiliar with love.