Hero Bank

Kaito Gōshō, who helps out others with his friends Mitsuo Zaizen and Fukuta Kanemaru, rushes to the aid of their companion, Nagare Amano, who is being bullied. Kaito manages to get back Nagare's wallet by beating one of the bullies, Raigo Raigou, in a Hero Battle, a digital battle game using rented battle suits powered by support from spectators. Later that day, Raigo brings his older brother, Shuuto, to challenge Kaito to another match for revenge, deciding to make Kaito his henchman should he win. However, during the middle of the battle, the rental period for Kaito's 'Bad Boy General' suit expires, leaving him naked and defenceless.

Kaito has been burdened with a ten billion yen debt in exchange for Enter the Gold. Big Money Company's Mitsuo Zaizen and Fukuta Kanemaru, and his sister Ai Gosho are in a panic! However, Kaito declares with sunny luminance that he'll pay back the debt. Then, Nagare makes a certain proposal. "I want to have a hero battle with you."

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With it decided that they will participate in the Big Money Hero Wars, Kaito and the others have their eyes on breaking through the preliminaries. But first, Kaito heads to his familiar barber to get some upkeep on his regent hairdo. However, a new beauty salon has stolen his customers and driven him to close shop.

Kaito and gang arrive at Big Money Bay to catch some fish for dinner where they meet the third heir to "The Fish Samurai Shop," the oldest shop in the Big Money Fresh Fish Market Castle: Isshin Uminari. The two of them immediately hit it off, but when they learn they are both in the Hero Wars, they clash in a Hero Battle! Whose passion will burn brightest!?

A rival appears for Big Money Company! Lead by Hana Akinai, their name is "Money-grubbing Corporation." Hana has cultivated the girl's "Detention Club," where they study with their clients into a huge success. Since Kaito hates to lose this gets his competitive streak all fired up. He starts the "Big Money Detention Club," but...