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

The hero Alec, seeking to meet someone as strong as himself, embarked on a journey to the future. However, due to a misunderstanding, his close aide had established an academy to nurture brides who would become his partners. And so begins his days with the princesses of the next generation, who have honed their skills under the guise of bridal training!?

(Source: Kadokawa, translated)