Chapter One - The Chaotic Murder Incident.

Harue Katsumi, a 19 year old High school student who's just about to graduate. Their best friend, Vivienne Karin, a college student, introduced them to Mittsu Tsukiko and Kumo Mizu. One day, a month before school ends, Harue, Vivienne, and Kumo visit Mittsu's home for a sleepover when all hell breaks loose.