“你是好孩子吗？还是坏孩子呢？”13位小学同学们在同学会上再次聚首，时间胶囊里出现了一本毕业相册，里面有6个人的脸被涂抹得模糊不清。紧接着，同学们接连发生了可疑的死亡事件。究竟是谁？又是为了什么？为了阻止悲剧继续，高木将（间宫祥太朗 饰）和猿桥园子（新木优子 饰）开始采取行动。然而，他们自身也隐藏着秘密。嫌疑人就在同学之中，真正的犯人究竟是谁？

As each group pursues their mission, a fierce battle unfolds over the tattooed prisoners. Who is friend, and who is foe? The fight leads them all to Abashiri Prison, where Noppera-bo, the man who holds all the answers, is locked away...