當外星人入侵地球之時，人類終將滅亡？抑或是與之共存。幽浮學界將人類與外星人不同程度上的接觸行為分為一至九類，而第七類接觸意指人類與外星人交配，進而繁衍出生物。本次作品以未來外星人與人類共同誕出的後代—未來人作為主軸。
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When aliens invade the earth, will humans go extinct? Or learn to live with it. Ufology divides close encounters between humans and aliens to different degrees into one to nine kinds. The seventh kind indicates that human mate with aliens; furthermore, reproduce life. This work is based on the future offspring born by aliens and human beings in the future — future man — as the main theme.
