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!
The school festival has arrived, and the students of Class A are putting together a maid cafe. Renko Hikawa returns to the school after collapsing in her fight against Kyousuke at the athletics festival, and she's looking forward to a school life even more enjoyable than before. When Renko's parents visit for the festival, they're even more determined to put an end to the relationship between their daughter and Kyousuke--by demanding him to drop out of school! With both the school's deadly exams and Renko breathing down his neck, will Kyousuke finally sort out his feelings for the Murder Maid?