TALES OF BYSTON WELL: GARZEY'S WING

Yesterday, Chris's biggest problem was getting into a good college. Now, his spirit has been hijacked by wings of light, and transported into an ancient world. Summoned by an enslaved tribe to lead a bloody revolution, Chris must quickly adapt to his new surroundings... or die. (Source: Anime News Network) — Description from AniList community (anilist.co).