
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...
Kaito and the others go to Fuji to help Fukuta's uncle and aunt pick tea leaves, in order to earn money to pay off their debt. Meanwhile, Nagare stays at home under the pretense of having to attend cram school, thinking over what he wants to do with himself. Later that night, Mitsuo notices something peculiar about a Snipe Sweeper participating in the Hero Wars. The next day, as Kaito and Mitsuo get into an argument with each other, Fukuta challenges both of them to a three-way Hero Battle between Kaito's Enter the Gold, Mitsuo's Game Console Beep Boop, and Fukuta's Tea Picking Cat. Mitsuo and Fukuta both team up against Kaito, but he throws their attacks back at them, and by the end of the match, everyone has forgotten why they were angry. Upon returning home, Kaito and the others learn Nagare is participating in the Hero Wars.
Nagare, who is once again approached by the mysterious figure, Money Ghost, accepts his contract for power, becoming enveloped in digital energy and having his personal data removed from the city's network. Noticing a disturbance in the system, Sennen sends a mail out to Kaito, Mitsuo, and Fukuta. The next day, the three boys are disturbed to find no one besides them know who Nagare is, finding all records of him have been wiped. Speaking with reporter Maki Kashii, the boys hear a rumor about people being dragged into the Hero Bank airspace. Later that day, Kaito receives an e-mail from someone who knows about Nagare, calling the boys to meet with them at Gappolis.
Sennen appears before Kaito and the others, explaining how he protected their memories of Nagare from being rewritten and suggesting Kaito undergo training in order to become stronger. Shishio Torai, a delinquent with a crush on Ai, offers to help Kaito in this regard, though it all proves pointless since he isn't using a Hero Suit. Afterwards, Kaito and co. are invited to a 'Hero Wars Seminar' by Kasumi Kamimaki, who is soon revealed to be a scam artist who had conned many victims. Angered by this, Kaito challenges Kasumi to a Hero Battle against his Hero Suit, Trick Suit. As Kasumi uses various tricks and cheats to put his opponent at a disadvantage, Kaito, spurred on by the support of the scammed victims, recalls Shishio's training and manages to win the match, after which Kasumi is arrested.
After winning a lottery in the shopping center, Kaito, Mitsuo, Fukuta, Ai, and Kaito's grandfather Zōan head to a hot spring inn, where Hana and the Gamitsui Corporation are coincidentally helping out. Later that night, Kaito accidentally breaks his Bankfon G after being spooked by Ai. Afterwards, Kaito runs into Hana, who explains she is trying to help out the inn, which holds a lot of memories for her, to keep it from being sold to a developer, before accidentally spraining her ankle. The next day, the developer, Ageo Sokoo, comes and smashes the inn's entranceway, trying to coerce the owner into selling the inn. Wanting to protect Hana's memories, Kaito challenges Sokoo to a Hero Battle against his Hero Suit, Heavy Builder, with the inn on the line.
Fukuta gets into an argument with his prophecy-predicting mouse, Platina, after he gets special treatment concerning a fortune teller being essential to the team's victory. After storming off, Fukuta comes across a fortune teller named Tamako Futoi, who seems to be popular due to her predictions concerning Hero Battles. As Fukuta decides to get his fortune told, he ends up buying a pricey fortune telling slip machine from her in the hopes of competing against Platina, only to find its predictions worthless. Whilst trying to return it, Fukuta spots Shishio, who was conned by Tamako, trying to get his money back by fighting in a Hero Battle against her Shryne Maiden Hero Suit, but ends up losing and has to buy another item. As Kaito decides to go up against her for a refund on Fukuta's item, Tamako adds a rule stating that if Kaito loses, she will take Platina.
With the Hero Wars preliminaries nearing its end, Kaito struggles to find opponents willing to fight him. Whilst he and the gang go with Ai to a factory in Iron Town to get her fridge fixed, some delinquents appear and cause trouble but are handled by the manager Koutetsu's son, Tetsunosuke "Kintetsu" Kanagata, whose arms were replaced with robotic parts whilst protecting Koutetsu from an explosion. Kaito and Ai return the next day to thank Kintetsu and help him and Koutetsu out, later learning that the factory is in debt.
As Iron Town comes under attack by Cyber Emperor due to Kintetsu's family failing to pay off their debt, Kaito confront's the company's president, Deborah Kizaki, who claims to have purchased Iron Town and plans to turn it into a theme park. Kaito puts his Enter the Gold suit on the line to win Iron Town back from Deborah in a Hero Battle scheduled for the next day. As Deborah does a background check on Kintetsu, desiring to take the rights to his iron body, Kaito is approached by Sennen and brought to his hideout. Sennen warns Kaito that Deborah's suit, Baron the Euro, is a prototype designed to be more powerful than Enter the Gold. Later that night, as the news depicts Kaito's challenge to Deborah in a negative light, Isshin and Kintetsu pay him a visit to give their support. As the battle begins the next day, Deborah uses a poison ability to drain Kaito's strength, and despite Kaito's best efforts, he is overwhelmed by Deborah and loses the match.
As the demolition of Iron Town continues, Deborah acquires a patent for Kintetsu' iron body and sends one of his minions, Rohan Yuri, to capture him so he can mass produce it. With Kaito determined to rescue Kintetsu, Sennen informs him that Enter the Gold has some hidden abilities, but notes Kaito doesn't yet have the requirements to access them. Later, Maki, who had discovered the scathing new reports about Kaito were fake, mentions there are many dark rumors surrounding Debora, including being behind the explosion that injured Kintetsu, stating they need to find solid evidence to prove it. In order to distract Deborah so that Mitsuo and Fukuta can infiltrate his network, Kaito challenges him to a rematch, with Isshin and Koutetsu putting their own stakes on Kaito's victory. As Kaito is once again overwhelmed by Deborah's speed, Mitsuo and Fukuta manage to successfully access his files and expose them to the media.
On his way to the venue of the Hero Wars finals, Kaito and co. get a lift from a speed-loving man. As the tournament begins, Isshin, Hana, and Nagare clear their first matches. Kaito ends up pitted against the man he met earlier, former F1 racer Hayaiyen Messa, and his hero suit, The Grand Prix, whose speed proves to be a match even for Enter the Speed. Despite Enter the Speed causing a strain on his body, Kaito's determination to never give up allows him to overtake Hayainen and defeat him. Whilst returning home, Hayainen, who was burdened with a past accident that caused him to quit racing, decides to put it behind him and focus on improving his Hero Battle skills.
Kaito arrives at school to find that Li-Chi Long, a young Chinese boy he encountered at the Hero Wars venue, has transferred into his class. Long soon starts attracting attention with his academic and physical prowess, prompting Kaito to try and befriend him. He invites Long to his house to try Zōan's pickled produce, which reminds Long of his own grandfather, who he entered the Hero Wars for. To repay an earlier debt, Long decides to have a Hero Battle with Kaito using his suit, The All Powerful Ura Dragon, ahead of the finals. After a trade of blows and gags, the match ends in a draw, after which Kaito decides to make Long the Gappori Company's vice-president, unaware that he is actually under the employ of Nagare.
In the A-block of the Hero Wars, Kintetsu faces off against Rohan and his suit, The Dostorbrewski, but ends up losing against his powerful armor. Wanting to become strong enough to beat him, Kaito tries to follow Long's advice and become 'nothingness', with not much success. Whilst at a karaoke bar, Kaito runs into his next scheduled opponent, Tometoshi Kakarimachi, who accidentally damages his Bankfon, though chooses not to force him to pay for the damages after hearing his sob story, instead leaving the repairs to Long. The next day, Kaito battles against Tometoshi's suit, Hilaryman, and despite Tometoshi being a rather weak fighter, Kaito finds himself hassled by a bug that Long had secretly installed, causing his special attacks to damage himself.
After a meeting with Nagare, Rohan, and Money Ghost, Long is interrogated by Mitsuo and Fukuta over what happened during the previous match. However, they just assume that Long had simply struggled to fix Kaito's Bankfon properly and give him the more minor punishment of participating in the Detention Club for a day. The next day, Kaito faces up against Rohan, who reveals he is a member of the Gold Force. Despite Rohan's strength, Kaito becomes eager to have fun fighting him, winning the battle with some tactical job switches. As a result of Rohan's defeat, Nagare has him disappear, revealing to Kaito he is also a member of the Gold Force.
Sennen meets up with an acquaintance, who is acting as a spy for him, trying to learn more about Money Ghost. Meanwhile, Hana is lined up to face against Long, with the winner moving on to face Kaito in the semifinals. Later that day, Long spends the day helping out the Gappori Company with helping others, though is promptly reminded of his mission by Nagare. The next day, Sennen appears before Kaito and the others, revealing Long is a member of Gold Force, though Kaito refuses to believe him. As the fight between Long and Hana begins, Long is conflicted between his friendship with Kaito and his mission to get revenge for his grandfather's death, but in the end, he casts aside his emotions and launches a vicious counter-attack against Hana, continuing to beat on her even after he wins. As Long vows to meet Kaito in the finals, Hana soon picks herself up and focuses on sales to earn money.
As Kaito and the others argue with each other over Long, Isshin helps them cool their heads with a water gun fight. After the guy manage to clean the pool together, during which Isshin learns Nagare, his next opponent, was everyone's friend, everyone comes around to swim in the pool. Meanwhile, Long drops by Kaito's house to drop off some food, receiving some words of advice from Zoan. The next day, Isshin faces off against Nagare, hoping to open his eyes, but is no match for Nagare's overwhelming strength.