Fujimaru's origin traces to an abduction by an eagle during infancy while his mother toiled in fields. Rescued by the samurai Sasuke, Fujimaru was raised as his disciple, forging his formative years under this mentorship. His rigorous training honed ninjutsu expertise, specializing in wind-based techniques. This cultivated two signature abilities: "multiplication" to conjure illusory duplicates disorienting foes, and "leaves" to summon wind swirls enabling swift evasion—core tactics in his combat repertoire. Development balanced physical prowess with tactical ingenuity, priming him for clashes against rival clans and feudal lords.

Dual motivations propelled him: reuniting with his biological mother and securing the Ryuen Book, a scroll chronicling perilous martial arts. This quest pitted him against Japusai, a fire-ninjutsu master pursuing the scroll for devastation. Their enmity shaped Fujimaru's path.

His journey unfolded through distinct phases. Early episodes saw his integration into the Fūma ninja clan and skirmishes in territorial wars among lords, aided by allies Mika and Taro—later known as Midori and Tasuke. Subsequent arcs introduced adversaries like the Nanban ninja faction and the ninja Haguro, escalating conflict scales. Through these trials, his character matured from naiveté into strategic acumen while retaining core integrity.

The narrative culminated with Fujimaru attaining both goals: reuniting with his mother and securing the Ryuen Book. Recognizing its danger in Japusai’s grasp, he destroyed the scroll, eradicating its threat. This act affirmed ethical conviction over personal ambition.