Kyousuke Kamiya has only just started to get used to his life in the blood-spattered hellscape that is Purgatorium Remedial Academy and its twisted version of school life. The architect of this series of gruesomely parodic extracurricular activities is the beautiful, charming Saki Shamaya--also known as the "Princess of Murder," a serial killer responsible for twenty-one deaths!
As the final exams for parole draw near, suddenly a transfer student appears! And the newcomer is none other than Kyousuke's little sister, Ayaka Kamiya! Ayaka could not be happier with this reunion but Kyousuke is terrified. What's more, he soon finds out that for the sake of meeting her beloved brother, Ayaka committed attempted murder. Considering Ayaka's mental state, Kyousuke resolves himself to protect her from the pack of killers he calls classmates. But, if someone, let's say Renko, were to find out that Kyousuke's most important 'Ayaka' is his sister, there'll be hell to pay... Facing dangers left and right, Kyousuke will have to be more resourceful than ever to get himself-and his sister-out in one piece.
Accused of a crime he didn't commit, Kyosuke Kamiya is sent to Purgatorium Rehabilitation Academy. Suddenly, he's surrounded by a variety of fetching lasses--each one a murderer! Worse, he's famous for being the "Dozen Demon," a killer responsible for twelve deaths! When the busty, gas mask-wearing beauty Renko Hikawa approaches him, the difference between death and desire becomes very narrow indeed. How is Kyosuke gonna graduate alive?
Even cutthroat murderers have school athletics festivals! Aiming for the top place in the school's first murderathon, Kyousuke and his classmates suffer through backbreaking conditioning. His life gets even more complicated when Renko's mother, Reiko Hikawa, pays a visit. She gives the pair an ultimatum: if their class doesn't win the athletics festival, Kyousuke and Renko can't get married! Can he sort out his ambiguous feelings for Renko while surviving the upperclassmen's bloodlust?
BRUTAL SUMMER LOVIN'...Summer break has arrived for the students with the highest exam scores, but it looks like Kyousuke will be stuck in school... However,when Eiri is suddenly summoned home, Kyousuke discovers her family has asked for him, too! He worries his stay with House Akabane, a family of assassins, will be a dangerous one, and Eiri isn't enthusiastic to return home. Surprisingly, they're met with a warm reception! ...So then why does Eiri look so sullen? The sweet, summery fourth volume heats up in the romantic comedy where the more Kyousuke loves, the more dangerous his life becomes!
IT'S A PRISON BREAK! Purgatory Remedial Academy is holding its annual school festival, where Kyousuke Kamiya couldn't be having a worse time. After recovering from the athletics festival, Renko Hikawa has been hounding Kyousuke endlessly, which only makes Eiri Akabane even more aggressive in her own attempts to seduce him. Right when life seems like it couldn't get any more complicated, the Akabane family decides to pop in for a visit with Mr. and Mrs. Kamiya, who demand that their children drop out! With the school's deadly exams coming up and Renko breathing down his neck, will Kyousuke finally sort out his feelings for the Murder Maid before time runs out in Psycome's killer finale?!