The protagonist, Yaiba (Kurogane Yaiba), is a wild samurai boy who trains in the jungle with his father, Kenjuro! By chance, Yaiba returns to Japan, where he meets his rival Takeshi Onimaru, who has the same samurai spirit as Yaiba, in a new training ground.
 
Yaiba is living a life of serious competition, but when Onimaru obtains the “Legendary Demon Sword”, he is on a journey full of spectacle and great adventure...! 

(Source: Crunchyroll News)

Upon enrolling in school, Yaiba quickly crosses swords with his soon-to-be rival, Onimaru. When Onimaru is transformed into a demon by the cursed power of Fujinken, the Wind God’s Sword, Yaiba embarks on a quest to Mount Tengu to find his own enchanted sword. But Yaiba lacks the skill and knowledge to use such a powerful weapon. If he can’t control himself, it will control him! 
(Source: VIZ Media)

Kurogane Yaiba is a boy who doesn't want to become what any regular kid would: He wants to be a samurai. That's why he undergoes a hard training with his father, knowing only the forest as his world. Then, one day, he is sent to Japan, where he has to deal with a whole new civilized reality, meeting the Mine family, the evil Onimaru and even the legendary Musashi, having lots of dangerous adventures, becoming stronger everyday.
 
(Source: Anime News Network)

Kaito Kuroba, a normal teenage student whose father is often absent. When his father dies under mysterious circumstances, he is made aware of his father's secret identity; a famous international criminal known as International Criminal 1412: the Phantom Thief, and that he was murdered by a mysterious organization for refusing to aid them in retrieving the "Pandora Gem"; a mystical stone said to shed a "tear" during the passing of a particular comet (often called the 'Volley Comet'), the consumption of which bestows immortality. 
 
He vows to prevent the organization from gaining immortality, and assumes his father's identity as he begins his quest for the gem. His only clues as to the gem's location are that it glows red under the full moon and that it is a doublet: a gem hidden within a larger gem. Thus, it would have to be a relatively large one with a bizarre history, and always stored in a place that never receives moonlight. He thus researches and steals famous priceless gems with odd histories from incredibly well-defended areas, and always returns them after the very next full moon.

Conan borrows a large amount of manga from Mitsuhiko and crazy things begin to happen around Beika City. Things aren't always the way they appear to be. A family asks Kogoro to help them protect a special sword in their dojo since Kaitou KID has sent word he's going to steal it. However Kaitou KID will have to steal the sword while Conan and Yaiba are after him.
 
(Source: Anime News Network)

An unaired pilot episode of Kenyuu Densetsu YAIBA produced in 1991 for Sunday magazine, re-released in the 2004 DVD-BOX set.

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