Set inside a pre-war duplex in downtown Manhattan, The Humans follows the course of an evening in which the Blake family gathers to celebrate Thanksgiving. As darkness falls outside the crumbling building, mysterious things start to go bump in the night and family tensions reach a boiling point。《地球守护者21》作为前作的续篇,由角川书店、IMAGICA以普通版和限量版OVA的方式发行。全6卷。本作的舞台移到了2001年,是与前作不同的,更写实的故事。世界观也更加黑暗。。