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Konno Hiroya is a high school student who loves the radio and belongs the broadcasting club. When he is told by the teacher that the club must be disbanded he manages to negotiate and is granted a four month grace period before the club is to be abolished. Meanwhile, a trivial quarrel between Hiroya and his classmate Ooga Kenta ends up being broadcasted by accident, which in turn creates a petite buzz throughout the school and leads to the two working together on the school’s lunchtime radio show.
Two men, torn by the moral dilemma of uncovering others' secrets for justice, work to solve unsolved cases using special MRI technology that can reproduce living memories of the dead.
In the spring of a new semester, a "ranking" is sent to Class 2-D. It clearly shows the rankings of all the students and the homeroom teacher. The one who ranks 1st is Himeyama Tsubaki, a kind and popular honor student recognized by everyone. But one day, without any warning, she commits suicide. A few days later, everyone in the class receives a suicide note from Himeyama, and from that day on, the class begins to fall apart.
