After half-heartedly ending her own life, Yomibayashi Iwo wakes up in a different realm - she's on the Ghost Train, where the souls of those who took their own life must repent by slaying the "Kotoda-ma," monsters borne from urban legends that wander the human realm. But all's not right with the land of the dead nor the living - supernatural conspiracies are brewing at Iwo's old school, and rumours of a mysterious "serial killer" are floating around…