在清潔公司工作的日比野卡夫卡，因與日本防衛(wèi)隊的希望之星一青梅竹馬的亞白米娜重逢，重燃曾經(jīng)放棄的防衛(wèi)隊夢想。然而，就在此時，他卻意外變身為擁有強(qiáng)大力量的“怪獸8號”。在后輩市川萊諾的幫助下，卡夫卡一邊隱藏真實身份，一邊參加防衛(wèi)隊選拔考試。然而，在生活似乎步入正軌時，一場由高智商怪獸發(fā)起的防衛(wèi)隊基地襲擊事件，徹底打破了平靜。

　　After a collision with a comet, a nearly 8km wide piece of the asteroid "Orpheus" is heading towards Earth. If it will hit it will cause a incredible catastrophe which will probably extinguish mankind. To stop the meteor NASA wants to use the illegal nuclear weapon satellite "Hercules" but discovers soon that it doesn't have enough fire power. Their only chance to save the world is to join forces with the USSR who have also launched such an illegal satellite. But will both governments agree?