Ore no Wanko-kei Yami Madoushi ga Iu Koto wo Kikanai

Loyd is a swordsman and leader of his clan. As the leader, Loyd removes his eyesore of a team member, the Shadow Wizard, from his ranks. Shortly after the wizard's banishment, however, Loyd's party faces utter defeat due to power imbalance. Loyd, having been reduced to nothing, has hit rock bottom. It's there where the Shadow Wizard he banished, Mizuha, appears. Oh how the tables turn in this magic-filled BL world.

(Source: MangaPlaza)