Aku no Taizai: Venomania-kou no Kyouki

Duke Sateriasis Venomania is the only survivor of the massacre that befell his household—a massacre that he himself perpetrated. Ready to end his life, Sateriasis is stopped by a mysterious figure known only as IR. Should he wish to change his fate and gain the affection of those who had previously tormented him, he need only stab himself with the katana that she provides. By doing this, he would make a deal with a demon, granting him the power to charm any woman he desires. He uses these abil...