年届三十的女子望月珠惠（西田エリ 饰）在生活中似乎体味不到丝毫的快乐，她无心寻找男友，与母亲相依为命而母女的关系却分外紧张。这一日，珠惠作为队长带领一支只允许女生出席的队伍来到了一座传说有天狗出没的深山露营。据说当年有个男人杀害了他的母亲，他落荒而逃，最后在山里变成了天狗。队伍中那个有些人生的女孩沼口真奈（小林歌穗 饰）是珠惠同事的女儿，她和好友安西诗织（安保彩世 饰）结伴而行。小小年纪的真奈无比叛逆，或者正因为心中隐藏着无法轻易为人道的秘密才让她如此焦灼。 深夜行军，原本就心事重重的女孩们，前方突然出现一个男人的黑影，这让她们变的慌乱起来……

Together with a girls camping club, Tamae sets out on a trip to a mountain where it is said that a long-nosed goblin lives. According to rumors, the goblin once was a boy who by mistake killed his own mother and has since been abducting people who have burdened hearts. The girls, who end up getting lost in the mountain, meets the mysterious boy Tsubaki. But who is he really?