A resident of Akagicho, high-schooler Yamato finds himself locked up after starting a fight. His classmate, Teru, appears and makes him a deal. In exchange for getting him out of jail, he wants Yamato to take on a job for him. Yamato and his rival, Ryugo, head for the designated spot, but are set upon by thugs Teru riled up. When the two teens win the brawl, Teru takes them underground, where the boys are in for the shock of their lives.
You two are now soldiers in 
our fight against the aliens.
Ihr beide seid jetzt Soldaten
in unserem Kampf gegen die Aliens.
Ahora sois soldados en nuestra lucha
contra los extraterrestres.
Vous êtes maintenant des soldats dans
notre combat contre les extraterrestres.
Ora siete soldati nella lotta contro gli alieni.