Herobank

Kaito Goushou, a young elementary school student from Big Money City, participates in Hero Battles using a Bankfon G, renting powerful hero suits to fight against other players. He hastily signs a contract for the unlisted hero suit "Enter the Gold," but soon discovers it comes with a significant debt of 10 billion yen. To clear his dues, Kaito must win Hero Battles, receiving power boosts from the system's public domain feature.