吕宋人即将离开故乡出国打工，在出发前却发现护照不见了，他和父亲一起沿着来路折返寻找。他们经过丛林与洞穴，吕宋人一路上背脊酸痛，他遇到远古祖先，也思索着自己在菲律宾的身份定位。在吕宋岛洞穴中被发现的远古人物种，显示出人类的演进过程并非线性，因而有了这段在史前脉络与现代文明 之间探问身份的奇幻浪漫之旅。

Different students from a high school cleaners group each deal with different pressures of being clean and pure while also discovering that the world is dirty and superficial to begin with.