is a Japanese manga series written and illustrated by . Matsuena first published a manga titled Tatakae! Ryà Âzanpaku Shijà  Saikyà  no Deshi, which ran in Shogakukan's Shà Ânen Sunday Super from October 1999 to February 2002. Kenichi: The Mightiest Disciple is a remake of the series, and was serialized in Shogakukan's Weekly Shà Ânen Sunday from April 2002 to September 2014, with its chapters collected in 61 volumes.
A 50-episode anime television series adaptation produced by TMS Entertainment aired on TV Tokyo from October 2006 to September 2007. Brain's Base produced an 11-episode original video animation (OVA) series, titled Kenichi: The Mightiest Disciple â The Attack of Darkness, released between March 2012 and May 2014. The anime television series was licensed in North America by Funimation in 2008, but the rights to the series expired in 2018. It was re-licensed by Discotek Media in 2020.
The Kenichi: The Mightiest Disciple manga has had over 12 million copies in circulation. A manga sequel, Shijà  Saikyà  no Deshi Kenichi 2: Tatsujin-hen, started on the ' digital platform in March 2026.
The story centers on Kenichi Shirahama, a 15-year-old high school student who has long endured bullying. After befriending transfer student Miu Fà «rinji, he resolves to strengthen himself and accompanies her to Ryà Âzanpaku, a dojo overseen by her grandfather, the undefeated martial artist Hayato Fà «rinji, where several masters of diverse disciplines reside.
Following basic instruction from Miu, Kenichi defeats a prominent member of the school's karate club, drawing the attention of delinquents. Initially training for self-defense, he eventually becomes a full disciple of Ryà Âzanpaku and develops feelings for Miu. His routine alternates between training under the dojo's six masters and confronting members of "Ragnarok", a gang of bullies seeking either to recruit or defeat him.
After Ragnarok's dissolution, Kenichi and Miu face Yomi, disciples trained by masters of Yami, a rival organization to Ryà Âzanpaku. While Ryà Âzanpaku adheres to the principle of sparing opponents (Katsujin-ken), Yami embraces lethal methods (Satsujin-ken). The conflict between the factions escalates until a final confrontation over Yami's goal to instigate global chaos, termed "The Eternal Sunset." Following the prevention of this scheme and Yami's defeat, both organizations disband. Kenichi continues his training at Ryà Âzanpaku; years later, he emerges as a renowned novelist, with implications that he marries Miu and surpasses her grandfather's martial prowessâÂÂfulfilling Hayato's vow that Miu may only wed someone capable of defeating him.
Manga author first published a manga series titled , which ran for 28 chapters in Shogakukan's monthly magazine Shà Ânen Sunday Super from October 20, 1999, to February 25, 2002, with its chapters collected in five volumes, released from September 18, 2000, to April 18, 2002.
Matsuena would later release the remake, Kenichi: The Mightiest Disciple, which started in Shogakukan's Weekly Shà Ânen Sunday on April 17, 2002. The manga finished after 12 years of publication in the magazine on September 17, 2014. Shogakukan collected the chapters in 61 volumes, published under the Shà Ânen Sunday Comics imprint, from August 9, 2002, to February 18, 2015.
A spin-off, titled , was serialized for three chapters in Shà Ânen Sunday S from February 25 to April 25, 2012; the chapters were collected in a single volume by Shogakukan, released on September 18 of that same year.
In January 2026, Matsuena announced on his X account a sequel series, titled , which started on Shogakukan's ' digital platform on March 25, 2026.
A 50-episode anime television series adaptation by TMS Entertainment was broadcast on TV Tokyo from October 8, 2006, to September 29, 2007. The first opening theme for episodes 1âÂÂ25 is "Be Strong", performed by Kana Yazumi, and the second opening theme for episodes 26âÂÂ50 is , performed by Diva àDiva (Miho Morikawa with Akira Asakura). The series' first ending theme for episodes 1âÂÂ15 is , performed by Issei Eguchi. The second ending theme for episodes 16âÂÂ25 is "Catch Your Dream", performed by Joanna Koike. The third ending theme for episodes 26âÂÂ45 is "Run Over", performed by Joanna Koike. The fourth ending theme for episodes 46âÂÂ49 is is performed by Sakura. The series' last episode uses the first opening theme "Be Strong" by Kana Yazumi as ending theme.
In North America the series was licensed by Funimation in May 2008. The series was broadcast on Funimation Channel. The rights to the series expired in 2018. In December 2020, Discotek Media announced that they had licensed the anime television and would have an upscale release slated for 2021; it was released on two Blu-ray Disc sets on August 31, 2021, and January 25, 2022. The series returned to Funimation's streaming service in May 2021. Crunchyroll added the series to their catalog in September 2021.
An 11-episode original video animation (OVA) series produced by Brain's Base started on March 14, 2012. The story continues from the Ragnarok Arc entering the Yomi arc. The second OVA episode, featuring later story in the Yomi arc, was released on June 18, 2012. The third OVA episode was released on November 16, 2012. The fourth and fifth OVA episodes were released on September 16, 2013. The sixth and seventh OVA episodes were released on November 18, 2013. The eighth and ninth OVA episodes were released on February 14, 2014. The 10th and 11th OVA episodes were released on May 16, 2014. The main cast for the OVA series is the same from those of the anime series except for Rie Kugimiya who replaced Tomoko Kawakami as Miu and Yuzuru Fujimoto who replaced Hiroshi Arikawa as her grandfather Hayato. The episodes aired in 2014 on Tokyo MX and BS11, with the title . Iori Nomizu performed the opening theme "Wish" (for episodes 4âÂÂ9) and the ending themes "Glory Days" (for episodes 1âÂÂ3) and "Breathless" (for episodes 4âÂÂ9). During its television broadcast, the series featured the opening theme "Higher Ground", performed by Tomokazu Seki, and the same original second ending theme "Breathless", by Iori Nomizu.
In January 2024, Discotek Media announced that it had licensed the OVA, and was released on a Blu-ray set with an English dub on May 28 of the same year.
On March 15, 2007, Capcom released the series' first game, Shijà  Saikyà  no Deshi Ken'ichi: Gekità Â! Ragnarok Hachikengà Â, exclusively on the PlayStation 2. The game was developed with Eighting.
Kenichi Shirahama appeared in the Weekly Shà Ânen Sunday and Weekly Shà Ânen Magazine 2009 crossover fighting game '. Characters from the series also appeared in another crossover game of the same magazine, Shà Ânen Sunday & Shà Ânen Magazine White Comic, also released in 2009 for Nintendo DS.
A volume was released by Shogakukan on September 18, 2007. An official guidebook was released by Shogakukan on May 16, 2014.
By February 2012, the manga had over 12 million copies in circulation.
Bamboo Dong of Anime News Network (ANN) offered a negative assessment of the first season (part one), criticizing its repetitive nature and inconsistent tone, which struggled to balance between mindless action and a semi-serious martial arts narrative. Dong found the technical explanations of combat techniques lacking compared to series like Naruto, despite the latter featuring fictional abilities. The review concluded by suggesting the show might only appeal to younger viewers seeking confidence-building stories, as it failed to engage older audiences. However, Dong later reviewed the first season (part two) more favorably, praising its improved focus on Kenichi's martial arts progression over his initial transformation from a weakling. The fanservice, while present, was deemed appropriate, and Miu was highlighted as a strong female lead. The series was recommended for fans of Naruto, Bleach, and other Shà Ânen Jump titles due to its action and grounded combat.
Theron Martin, also writing for ANN, likened the first season (part one) to The Karate Kid (1984) but noted its lighter tone, which helped mitigate its often absurd scenarios. While criticizing its early pacing and comedic excesses, Martin praised its exploration of martial arts fundamentals and concluded that despite its flaws, the series delivered an entertaining, if cheesy, experience.
Davey C. Jones of Active Anime lauded the first season (part one) for its dynamic fights and humor, calling it a perfect blend of comedy and martial arts action. In reviewing the second season (part two), Jones compared it favorably to Ranma ý, emphasizing its energetic combat and comedic appeal.
C.M. Brendelson of Otaku USA described Kenichi as a typical underdog protagonist akin to Peter Parker, while Miu stood out as both highly skilled and visually striking. The series was noted for its focus on Kenichi's growth through defeat rather than a desire for supremacy, and while fanservice was prevalent, it did not overshadow the narrative. Brendelson concluded that the show, while not universally appealing, offered a lighthearted mix of action and comedy.
Allen Moody of THEM Anime Reviews praised Kenichi as a relatable protagonist with strong moral convictions, along with the series' action and character dynamics. However, he criticized excessive melodrama during fight sequences.