I Reincarnated Under the Strongest Swordmaster and Sage and Unknowingly Became Unrivaled

A salaryman who is reincarnated into an alternate fantasy world as Rain, after sacrificing himself to save a child. He is saved, however, by two famous beauties who are the most feared across the land. Rain's school life begins even as he already leveling up with the cheat skills of both sword and sorcery.

(Source: Anime News Network)