嫌われ勇者のダンジョン無双物語

Betrayed and thrown into an abyss, a man rises as its master, hunting down his killers one by one. But when the one who got away returns with an army, he plays both sides: a hero by day, abyss lord by night. As he uncovers the empire's dark grip on its people, the soldiers closing in realize too late: he's not their prey. He's their end...