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. One of these women happened to be the one who "made him for a fool." This girl, now a young woman, was his childhood friend, Gumina Glassred.

In his Lasaland mansion, Sateriasis Venomania impales himself on the Venom Sword, making a contract with I.R. and the Demon of Lust; as a result, his body is filled with "Bloodlust". Several months since then, in the Summer of EC 136, Kachess Crim reads a report of women who have gone missing in the Asmodean region, including Lukana Octo, Mikulia Greeonio, and Gumina Glassred. He lingers on the last name, Lilien Turner, who has disappeared in April of EC 136, the same year as Lukana's disappearance.
 
(Source: The Evillious Chronicles Wiki)

Book two of the Aku no Taizai series.
 
Banica Conchita, a woman who, at one time, ate only the most delicious and exquisite food. Now, however, her tastes have evolved so that she wants something new and grotesque every day, and nothing enters or leaves her palace. The fifteenth personal chef of the year asks for a brief vacation, but she, angry, decides to eat him. Running out of food to eat, she ends up eating her butler and maid, and when everything has gone, she ends up eating herself—which nobody else will ever know what it tastes like.

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