Like every year, Jim, Ray, Brad and Paul leave the town for a week to go hunting in the woods. But this year everything is different: There's not a single animal to be found, the whole forest has fallen quiet. Two female campers they meet have mysteriously disappeared the next day, leaving their whole equipment behind. And then they start to behave weird themselves... An alien ...

擔(dān)任臨時教師的君島穗香(澀谷凪咲)，目擊了一個女學(xué)生從屋頂跳下的瞬間。當(dāng)她在暑假補習(xí)班上課時，又注意到有個不應(yīng)該存在的學(xué)生。不久后，穗香與補習(xí)班的三浦瞳(早瀨憩)、前川武(山時聰真)等學(xué)生們，得知了與那個女學(xué)生有關(guān)的令人震驚的事實。

　　當(dāng)西貢淪陷時，越南陷入一片動蕩不安的局面，巴洛克上校(查克·諾瑞斯 Chuck Norris 飾)的妻子琳是越南人，她陽陰錯差來不及撤退，卻讓巴洛克誤以為她已被炸死，只有傷心地坐直升機回美國。十二年之后，一位來自越南的牧師告訴他，琳和他的兒子還活著，生活十分清苦，于是決定他獨自前往越南去拯救妻兒。