Aku no Taizai: Venomania-kou no Kyouki

Book one of the Aku no Taizai series. In childhood, Duke Sateriasis Venomania was mocked and taunted by those around him. As an adult, he made a pact with the devil to gain an irresistible charisma over women. They began to flock to the basement of his mansion, where he formed a harem for himself. Among these women was the one who had once made him a fool. That girl, now grown into a young woman, is his childhood friend, Gumina Glassred. Her arrival brings the memory of his early humiliation into the very harem his devilish bargain created. This is the opening volume of the series, centering on Venomania's deal, the women drawn to him, and the childhood friend whose presence ties his past to his present.