While running late for class, Kenichi Shirahama bumps into new transfer student Miu Furinji. At the karate club, Kenichi is challenged by another student, Daimonji, to a match; the loser must leave the club. On the way home, Kenichi is awed when he sees Miu easily defeat a group of thugs. On Miu's advice, he heads to the Ryōzanpaku Dojo to train in martial arts. He meets Miu's grandfather Hayato Furinji (The Invincible Superman), Muay Thai fighter Apachai Hopachai (The Death God of the Muay Thai Underworld), Swordswoman Shigure Kōsaka (The Maiden of Weapons), Chinese martial artist Kensei Ma (The Master of All Chinese Martial Arts), Karate Master Shio Sakaki (The 100th Degree Street Fighter), and Jujutsu Master Akisame Kōetsuji (The Philosophical Judo Master).