Clad in her wedding dress, Izumi , a teacher at Seishun High School is found stabbed to death and floating in the school`s rooftop pool. A student confesses to being her murderer to Hibino Meina , class 3C`s president and Goshima, the detective in charge. Noting inconsistencies with their supposed methodology and an incomprehensible motive, this student`s confession is quickly ruled out , only to have another one immediately step forward to take responsibility for the crime. Why are her students...