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.
Naturally. All the residents here 
have had their memories erased.
Natürlich nicht. Allen hier
wurden die Erinnerungen gelöscht.
Es normal. A todos los habitantes
se les ha borrado la memoria.
Bien sûr, la mémoire
de tous les résidents a été effacée.
A tutti gli abitanti
è stata cancellata la memoria.