A gigantic space monster appears in a city and begins to destroy it. People scream and flee, but five high‑school students, En, Kai, Shin, Yoku, and Ryu, fail to escape and rush into a nearby patrol car. As the monster approaches, they accept their impending death. Suddenly the patrol car glows a blue‑white light and vanishes into a mysterious space, carrying them. They are astonished to find an alien standing before them. He is a Bravian officer of the Space Police Organization, which is responsible for maintaining peace and order throughout the universe. He explains that he is being targeted by ferocious aliens from the Space Prison Sargasso. He …