Isekai Monmusu Sensation

The protagonist is reincarnated into a fantasy world with powerful cheat abilities, only to find that humans and demons already coexist peacefully. Disappointed at the lack of a traditional harem scenario, he enrolls in the private Monmusu Academy—a school designed to promote human-demon coexistence and address population decline by teaching students about romance and reproduction across racial lines. Despite his supernatural gifts, the protagonist is an inexperienced and timid virgin, prompting the monster-girl teachers at the academy to provide him with intensive supplementary lessons in love and seduction.