In Big Money City, players participate in "Hero Battles" using Bankfon Gs to rent top-of-the-line hero suits and battle against other players. Winning these battles grants them access to the public domain feature, providing them with a power boost. Kaito Goushou, a kind-hearted elementary student, quickly agrees to rent the highly sought-after "Enter the Gold" hero suit from an untrustworthy priest named Sennen in order to help others. Unfortunately, he soon realizes that this powerful suit comes with an enormous debt of 10 billion yen, which can only be paid off by winning numerous Hero Battles.