The story focuses on Kenichi Shirahama, an average 16-year-old high school student who has been picked on his whole life. However, on his first day of class, he meets and befriends the mysterious transfer student, Miu Fūrinji. Driven by his desire to become stronger, he follows her to Ryōzanpaku, a dojo housing several masters of diverse martial arts, led by her grandfather Hayato Fūrinji, who is known as the strongest man on Earth. After learning basics from Miu, Kenichi is able to beat a high-ranking member of the school's karate club, and becomes a target for all the delinquents in the school.
After becoming one of the eight fists, Kisara starts to hunt on those who deserted her. Takeda is attacked by Kisara's gang.Watch Now:Amazon
While running late for class, Kenichi bumps in to the new transfer student Miu. At the karate club, Kenichi is challenged by another student Daimonji for a match. With the loser losing the right to be a member of 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.
With the news of Kenichi's victory over Tsukuba spreading all over, the strongest gang in the prefecture Ragnarok now has their eyes set on Kenichi. All Kenichi can do now is to train and prepare for the worst. For a change of pace, his teachers suggest that he goes on a date with Miu but they seem to have an ulterior motive.
Con el entrenamiento de Kenichi con Apacahi siempre terminando lo mismo, Apachai está tratando de aprender una manera de ser fácil con él. ¿Aprenderá Apachai cómo ser fácil con Kenichi, durante el entrenamiento?Watch Now:Amazon
Kenichi is easily defeated by Tsukuba despite his heavy training, so he becomes greatly demotivated. With a desire to become stronger and more courageous, Akisame-sensei agrees to finally teach him martial art fighting techniques. Kenichi is put through more rigorous training from the four masters of martial arts. Sakaki-sensei takes a liking to him, so he teaches him a technique that a Sports Karate Style user is vulnerable to. Eventually Kenichi runs into Tsukuba and fights him again, this time he uses the techniques taught to him and he emerges victorious in the battle. Little does he know what troubles he will face as a result of it in the future.
Takeda Ikki, the puncher from the Ragnorak gang, is still searching for Kenichi but has had no luck so far. So he decides to hold some of Kenichi's "so called friends" hostage to lure him out. Now it is the time to see if Kenichi's training on Muay Thai, with Apachai, had an effect.
Kenichi is with fellow gardening club member Izumi, enjoying what is left of his peaceful life because following this he has more extensive training to do. During his training with Miu it doesn't take long before he runs into the Ragnorak and it is Taichi Koga the kicker he is up against.
Kenichi decides to spend the entire weekend at the Ryouzanpaku dojo and train for his imminent fights. His little sister then goes to check out this dojo, to see what kind of torturous things he's going through.
After watching Kenichi defeat Daimonji, Tsukuba, the strongest member of the karate club, gets suspicious of Kenichi's abilities. At the school Miu, joins the girl's gymnastics club and soon becomes the center of attention after displaying her abilities at gymnastics. Kenichi desperately tries to avoid Tsukuba, but is soon caught and gets beaten to a pulp. Seeing Kenichi repent his loss to Tsukuba, Akisame decides to start training him in some martial arts techniques.
Renka discovers where Kensei Ma is living and appears in Ryouzanpaku, determined not only to bring her father back home, but to win Kenichi's heart too, much to Miu's jealousy.
Kenichi begins his training at the Ryōzanpaku dojo under the guidance of Akisame. The training focuses on building strength and stamina. Concerned about Kenichi's fight with Daimonji, Miu secretly teaches him a stepping technique to maneuver around. Even though Kenichi is able to defeat Daimonji at the challenge, he yields his membership of the karate club after being accused of using a throw in a karate match.
Unable to evade Ryuto's punches at all, Kenichi starts to counter attack by constantly changing his fighting style, imitating his masters' personalities (to their combined horror and amusement).
Honoka decides to infitrate the Ryōzanpaku by herself, much to her despair.
Es la continuación de la intensa lucha de Kenichi con Takeda y Kenichi parece tener la ventaja, pero su amabilidad puede resultar ser su perdición. Kenichi también se pregunta qué hizo que un boxeador tan prometedor como Takeda se convirtiera en un delincuente
Hermit reappears eager for another fight against Kenichi, but he ends up having a sudden encounter with Honoka, unaware of who she is.
While training in the mountains, Kenichi gets lost but is rescued by a mysterious man named Ogata Ishinsai, and receives from him a tempting proposal that could change his destiny.
Kenichi receives an anonymous love letter, and while going to meet the person who wrote it, he ends up seeing Niijima and his Shinpaku comrades in trouble.
Ragnarok discovers Niijima's Shinpaku Alliance hideout. Loki has his underlings surrounding the building to put an end to the Shinpaku Alliance. The rival gangs go all out in this decisive battle. Kenichi receives a message from Niijima and becomes concerned about the situation back home.
Rivals from another dojo break into Ryōzanpaku to challenge their masters, but only with Kenichi and Miu present at the moment, they end up having to confront them by themselves.
After his defeat with Shinosuke Tsuji, the masters decided to have Kenichi live with them. This would include 24 hour hell-like training. Kenichi accepts with the idea that he would be living with Miu under the same roof. Kensei later drags Kenichi do a "special training" with him by tryring to peek on Miu and Shigure's bath unnoticed.Watch Now:Amazon
Kisara officially becomes one of the eight fists of Ragnarok, the highest ranked members of the organization.
Kenichi feels uneasy about how he should express his feelings to Miu. After Kisara hears of Takeda's defeat Tsuji Shinnosuke is sent to kill Kenichi, however he invites him to join his gang instead. When Kenichi refuses and debunks his way of thinking, Shinnosuke challenges him to a fight.Watch Now:Amazon
Kenichi and Hermit's fight is interrupted by Loki, who using Honoka as a hostage, renders Kenichi unable to fight back, much to Hermit's anger.
Kenichi continues his training with The Elder while the Shinpaku Alliance tries to develop a unification with Kisara's subordinates. Meanwhile, Berserker and Freya begin to hunt down the Shinpaku Alliance.
Kenichi arrives just in time to save his comrades. Kenichi is enraged after discovering the defeat of Takeda, Ukita and Siegfried so he charges towards Berserker but Hermit stops him. Hermit fights Berserker instead so that Kenichi is at his best physical form when he fights Odin. Berserker becomes excited in the fight with Hermit and unleashes his most feared fighting style, Berserk mode.
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