Aku no Taizai: Venomania-kou no Kyouki

Book one of the Aku no Taizai series. Duke Sateriasis Venomania, who, in his childhood, had been mocked and taunted by others. In adulthood, he made a deal with the devil to have an irresistible charisma to women. As a result, women began flocking to his mansion's basement to create a harem for him.