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Four guys who have a reunion after 10 years, since their high school graduation. They follow a sudden impulse to get their small revenge on a hateful teacher who had often punished them physically. It was supposed to be just a prank, however, the teacher is found dead the following day…

The body of the former teacher, who Yosuke and his mates abducted as a prank is found. Meanwhile, the four guys try to plan an alibi to cover up the possibilities of being blamed for his death.

Kanako comes to Yosuke’s apartment, due to her suspicions against them for the murder of the former high school teacher. Meanwhile, Yosuke’s behavior all of a sudden changes, when Kanako asks him about an accident which had occurred 18 years back.

A letter of will which is thought to have been written by the former high-school teacher suddenly gets delivered. Meanwhile, Yosuke and his reunion mates meet up which leads to some useful clues about the incident...

Yosuke has a vague memory since the point of being almost pushed off a pedestrian bridge. And when he wakes up, he realizes that there are blood stains all around his washroom, leading to a major confusion…

Yosuke and Misato visit the grave stone of a fellow class mate who had committed suicide, just before high-school graduation. Meanwhile, they coincidentally meet someone unexpected…

Yosuke finds out from a special document preserved at high-school, that the girl who had comitted suicide had been pregnant right before her death. Meanwhile, a heart-bumping info about the prank creeps out...

What is the truth of the incidences which have occurred up until now? The secrets of the past finally gets revealed. And will Yosuke be able to accept all the consequences? Tune in for the ultimate climax!