Saikyou Yuusha wa Oharai Hako → Maou ni Nattara Zutto Ore no Musou Return
最強勇者はお払い箱→魔王になったらずっと俺の無双ターン
A hero named Garius, who was disliked by humans due to his appearance, devoted himself to helping them. After being betrayed, he lost faith in humanity. He now chooses to aid the demon world, having discovered the acceptance and warmth he desired among demons.
