saigo no eiyū ni sasagu hanayome gakuen 　 toki o koeshi mahōtsukai , jidai no hime to kizuna o musubi hāremu o kizuku (Associated Names)

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…