Somewhere in the Capital lies the Holy Acacia Girls' Academy, a prestigious Institution overflowing with elegance. However, beneath its refined facade, the academy is ruled by a nefarious group known as the 10 Petals - daughters of the most powerful figures in society, casting a dark pall over the school. Into this oppressive world steps Naruse Narumi, a mysterious transfer student. Methodically, she begins to eliminate the 10 Petals one by one, in an act of calculated revenge. But what drives her to do it? And who truly is Naruse Narumi? Now the curtains rise on this chilling psychological thriller.