A 3rd-year student and the boss of Nekketsu High. He has a brown regent hairstyle with a slight buzz-cut look, usually wearing a red T-shirt under his Hakuran (white gakuran). His special move is the Mach Kick. He is dating Hasebe from Reiho. He once single-handedly stormed and crushed a Yakuza hideout after his friend Hiroshi was attacked. He is an all-rounder in both fighting and sports. His allies include Nanase, Sugata (both 2nd years), and Hiroshi (3rd year).

A 3rd-year student at Hanazono High, currently repeating a year. He is trusted by his peers as the leader of Hanazono. His special move is the Mach Punch. He sports a blue regent hairstyle and a blue gakuran, which he wears open without a shirt, showing bandages wrapped around his stomach. He is surprisingly handsome. His subordinates include Saotome and Yoshino (2nd years), and Washio, Wataru, and Shimizu (3rd years). He trusts Saotome as his second-in-command. Even when his girlfriend is kidnapped, he stays calm and remains a kind leader who jokes with his juniors and Kunio. He doesn't smoke.

A 3rd-year student at Reiho High. She speaks informally to Kunio but uses polite speech with Riki. She has purple medium-length hair and is exceptionally beautiful. She possesses surprising combat strength. She assists the user, Kunio, and Riki. Usually called Hasebe. She smokes.

A 2nd-year student at Hanazono High and Riki's girlfriend. She is currently held captive by Reiho. Her kidnapping is the catalyst for this journey.

An old friend of Kunio's and a fighter on par with Riki and Kunio. He is a broken character who uses dark magic called 'Yamada's Art.' He brainwashed the former student council president, Onizuka Takashi, making him cold and cruel, and established the Four Heavenly Kings led by Kobayashi Masao, including Mochizuki Shun, Taira Kihuyomi, and Kinoshita Tadashi. Dreaming of national conquest, he has seized control of Hakutaka Industrial High, Tanibana High, and Horyo High, brainwashing over 1,000 students. He used to have a crush on Hasebe.

A 3rd-year student at Reiho High and the head of the Four Heavenly Kings. He appears gentlemanly and polite, but he has a dark past involving his father's failed factory business. He has spiky orange hair, and his special move is the Mach Chop. His base is the Kobayashi Industrial Factory.

A 3rd-year student at Reiho High and a member of the Four Heavenly Kings. He has a refreshing personality and is very popular. He is an incredibly fast runner, making him difficult to hit. His special move is the Nitro Attack.

A 3rd-year student at Horyo High and a master of headbutts. He is popular for his handsome looks and, unlike other characters, has a kind heart. His special moves are the Seiken Punch and the Headbutt Special. Usually called Goda.

A 3rd-year student at Tanibana High and Goda's close friend. Despite his spiky blue hair and fierce personality, he is popular for his pure and playful side. He is a master of staff fighting and loves Kendo. His special move is the Staff Special.

A 3rd-year student at Reiho High. He was the student council president before Yamada took over. He has a Frankenstein-like appearance and a blunt personality. His special move is the Human Drill.