Aku no Taizai: Venomania-kou no Kyouki

Duke Sateriasis Venomania, once a noble of high standing, finds himself at the center of a dark tragedy that has left his household in ruins. Consumed by despair and ready to end his suffering, he encounters a mysterious woman known only as IR, who presents him with an otherworldly proposition. She offers him a cursed katana and a pact: by sacrificing a part of his humanity, he can gain the power to captivate the hearts of others. Tempted by the promise of love and acceptance he was never granted, Sateriasis accepts the demon's bargain, awakening abilities that allow him to charm any woman who meets his gaze. As he indulges in his newfound power, gathering companions drawn by supernatural allure, the Duke begins a transformation that blurs the line between man and monster. His once noble heart grows increasingly corrupted by the very magic that grants his desires, leading him down a path where the distinction between love and possession becomes dangerously thin. In a world where such dark pacts come at a terrible price, forces begin to stir that may challenge the Duke's reign of desire, setting the stage for a confrontation between the corrupted and those who would restore balance.