对当下的生活倍感无聊和失望的高中生高畑瞬（福士苍汰 饰），从没想到人生会发生如此可怕的巨变。课堂上老师的脑袋突然爆开，紧接着会说话的达摩不倒翁出现在讲桌上，逼迫着惊慌失措的学生们玩起了“一二三不许动”。经过数轮血腥较量，瞬成为班内唯一的幸存者，他跌跌撞撞逃出教室，遇到了也从死亡线上暂时逃脱的青梅竹马秋元依智香（山崎紘菜 饰）。两人在寻找出路时撞进了体育馆，谁知这里正是下一轮游戏的舞台。未过多久，巨大的招财猫（前田敦子 配音）出现，和幸存者们玩起了抓老鼠的死亡游戏。考量体力、智力和想象力的关卡连番到来，瞬、依智香还有周身散发着死神气息的天谷武（神木隆之介 饰）迎接着命运的巨变…… 　　本片根据金城宗幸（原作）、藤村绯二（作画）的同名漫画的第一部改编。A 2nd-year high school student named Shun Takahata lives an ordinary teenage life until one day he's suddenly forced to participate in a series of children's games such as "Daruma-san ga Koronda" with death as the penalty for losing. With no knowledge of who's behind the games, he's left with no other choice but to keep winning as his only means of protecting himself and his childhood friend, Ichika. Meanwhile, a troubled classmate named Takeru seems to actually be relishing the opportunity to get other students killed.