Book three of the Aku no Taizai series.
 
"For the sake of your happiness." 
Based on the song posted by mothy on Nico Nico Douga in May, 2011. The song with the theme of "Sloth" in the Seven Deadly Sins Series, it tells the story of Margarita Blankenheim: a girl who created a peaceful Gift for the troubled people.

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.

Book four of the Aku no Taizai series.
 
"And then black turns to red."
 
Based on the song posted by mothy on Nico Nico Douga in June of 2011, tells the story of Lemy, an orphan who becomes the adopted son of the wealthy Julia Abelard. And also depicts how he became the murderer known as "Fifth Pierrot".
 (Source: Japanese Publisher, translated)

A vast kingdom called Lucifenia, whose popular name was the "Kingdom of Yellow," was ruled by a tyrannical fourteen year-old princess named Riliane. Under her absolute monarchism, everything was exploited from people and the ones who did not obey her were executed without mercy. Allen, a servant who looked a lot like her, was always beside the princess whom Lucifenia's people called the "Daughter of Evil." The princess and the servant were the same age, since the two of them were actually twins who were separated shortly after their birth, with Riliane taking her mother's position as the country's ruler and Allen works in the palace as a servant since he was given up for adoption. The princess's selfishness and jealousy caused a war and many deaths, and their secret clockwork of fate was going to spin madly.
 
(Source: Vocaloid Wikia)

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