KUROTONBI NO SEIJA: TSUIHOU SARETA KAIFUKU JUTSUSHI WA, ARIAMARU MARYOKU DE YAMI MAHOU WO KIWAMERU

Russel is a Saint who was an expert in recovery magic. He was in a group with his childhood friends until the rest of the members learned recovery magic. Branded unnecessary and expelled from his group of friends, he meets a mysterious beauty named Sybilla. His infinite magical potential, combined with her guidance now allow him to reach heights once deemed impossible! — Description from AniList community (anilist.co).