Description:

Sentenced on false charges, Kamiya Kyousuke was forced to enroll in the "Purgatorium School of Rehabilitation" where juvenile convicts are gathered. His surroundings include pretty girls with beautiful legs or fluttering hair... But they are actually convicted murderers. Attracting extra attention in school as the special 'Mass Murderer of Twelve', Kyousuke is also drawing the advances of the unidentified gas mask-wearing beauty with the giant rack, Hikawa Renko. In order to graduate safely, will Kyousuke be able to resist temptation laced with death!? Every single classmate is a murderer. LOVE=KILL! The deeper the love, the greater the risk of death, a hardcore romantic comedy!! Let the lessons begin! (Source: Baka-Tsuki)

Description:

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)