Ranmaru Hibikiya starts his first day at Asao Private School, enrolled as a favor to his uncle — the dean — who has asked Ranmaru to act as his informant on campus. Ranmaru accepts. What he finds is not normal campus misconduct: there is real violence happening, and deeper investigation points toward an underground society connected to the abnormal behavior he is witnessing. Somewhere in the middle of investigating all this, something happens to Ranmaru. Exactly what, and why, is what the game exists to answer.