A series of student suicides strikes Hokufu High School. One student hangs himself in a school restroom; two others leap to their deaths from the school building. In a class widely celebrated as "the best, where everyone gets along," why would this happen...?

Tomohiro Kakiuchi is approached by his childhood friend and classmate, Mitsuki Shirase, who confides an unbelievable assertion: "They weren't suicides. Every single one of them was killed by him."

An unprovable crime executed through a "power to compel others to commit suicide." Granted just one chance to bring the culprit to justice, Tomohiro throws himself into a solitary, extraordinary quest for the truth. A landmark youth mystery for a new era.