梓的妹妹惠自杀身亡，梓认为事情另有蹊跷，展开了追查。<br>梓打听到，有个神秘人正在进行“援助交际扑灭运动”。此人假借援交之名接近女高中生，和她们发生关系后，残忍地在她们身上烙下“母猪”的印痕。<br>梓想起惠的大腿上也有这样的烙印。难道妹妹是那个变态神秘人的牺牲品？！梓获得了惠的同学彩的帮助，准备引蛇出洞，为妹妹复仇。然而她并不知道，等待着她的是超乎想象的可怕地狱……
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