Buso Renkin - Season 1 (2006)

Kazuki and Tokiko search for a student who has been absent from school for the past four days and come across a sickly third-year student who turns out to be the creator of the homunculi...

Evading the homunculus Washio's attack, Kazuki and Tokiko fall back to form a plan. The two devise a series of high-speed attacks, but Washio's natural instinct and warrior experience sees through their plan.

Seeking the antidote, Kazuki goes to Chono's house, where Chono's father tells him he has cut ties with his son. Kazuki heads to the warehouse behind the Chono household, the very place where his ancestor conducted his alchemy research...

Captain Bravo of the Alchemist Army recruits Kazuki to be Alchemist Warrior. Anticipating underground enemy activities within Ginsei City, Tokiko transfers to Kazuki's class, and Bravo becomes the manager of the school dormitory.

Bravo begins training Kazuki to harden him into an Alchemist Warrior. Meanwhile, Tokiko is ordered to safeguard the kakugane originally taken from Bravo's subordinate Alchemist Warrior.

One rainy afternoon, Kazuki comes across two third-year students, school class president Ouka Hayasaka and her younger twin brother and star player of the Kendo Club, Shusui.

Both Kazuki and the Hayasaka twins cannot hide their shock at learning each other's identities as Alchemist Warrior and LXE. But the Hayasaka twins are determined to fight. Kazuki proposes to battle Shusui one on one until Ouka returns from shutting down the school security system

Shusui recalls his earliest memories: being abducted by a woman claiming to be his mother and the days he spent in confinement. The twins grew up never questioning the closed world they lived in.

In the forest outside of Ginsei City, Bravo, Kazuki, and Tokiko decide to infiltrate the LXE hideout and take down the LXE before they can revive the Warrior Traitor, but they find the place empty except for Moonface...

Bravo rages in a seemingly never-ending battle against Moonface, while Tokiko cannot help but question and fear the intense power Kazuki is displaying as he destroys the hordes of homunculi while his friends cheer him on. Then a kakugane-equipped Papillon enters the scene and begins a battle against Dr. Butterfly. Butterfly attempts to break down Papillon's mind by making him remember his lonesome and fragile past as a human, but Papillon cuts his way through with Near-Death Happiness. Amidst all the chaos, the Warrior Traitor finally awakens.

Stopping the Warrior Traitor is the only means to save his friends. Kazuki heads to the rooftop and with full force destroys the Restoration Flask, but finds the shattered flask to be empty! While in midair the Warrior Traitor seizes Kazuki's lance with his bare hands. Awakened from his century-old slumber, he is Victor, said by Butterfly to be a third type of being that surpasses both humans and homunculi. Recognizing Kazuki's attack as the Buso Renkin of an Alchemist Warrior, Victor expresses his raging hatred, and his black kakugane Buso Renkin shatters Kazuki's ...

Becoming like Victor, Kazuki is driven by his fighting instinct. Victor leaves the scene, promising to return. Kazuki tries to follow, but thanks to Tokiko's sorrowful cry, he regains his consciousness.

Kazuki and the gang are enjoying the summer, except for Tokiko, who sneaks off to meet with Gota Nakamura, the newly appointed Alchemist Warrior, who informs her of their new mission.

Thanks to the power of the black kakugane, Kazuki is revived. In order to deal with the black kakugane, Kazuki decides to go to the place where Tokiko found it. Tokiko tells Kazuki that she will not leave his side.

Kazuki, Tokiko, and Gota head toward the Newton Apple Academy for Girls, an all-girl boarding school where the black kakugane was originally located. Warrior Chief Hiwatari and his re-extermination squad are pursuing Kazuki but are stopped by Papillon.

Caught in the explosion created by Hiwatari, Tokiko and Gota stray from Kazuki. Meanwhile, the search and destroy team locates Victor and launches a full-scale attack. But the ability of Victor's Buso Renkin to control gravity proves too powerful.

Without speaking a word, Kazuki and Bravo battle to settle the score. Kazuki attacks with his lance, but even that is not enough to penetrate Bravo's Silver Skin. Bravo accepts Kazuki's growth as a warrior and reinforces his will to re-exterminate Kazuki.

Hiwatari's Buso Renkin, Blaze of Glory, engulfs everyone but the Silver Skin-equipped Bravo...or so it seems. To Hiwatari's surprise, inside the two Silver Skins were Kazuki, Tokiko, and Gota.

The Alchemist Army delivers a full-scale attack against Victor. But in the midst of the attack, Victor's evolution reaches its final stage, increasing his powers to unimaginable levels.

With only moments until the completion of the white kakugane, which can revert a Victornized being into a human once more, Kazuki is faced with the ultimate choice of whether to use the cure on himself or Victor.

Kazuki has decided to use the perfected white kakugane on Victor. By placing himself in suspended animation, Kazuki can put an end to being further Victornized by waiting until another white kakugane can be perfected by Papillon.

Following Kazuki and Victor's disappearance into the heavens, peace returns, and time passes. Everyone who knew Kazuki feels his loss. Unable to accept reality, Tokiko spends her days in idleness.

Papillon shows Tokiko the new white kakugane he has forged for the sole purpose of reverting Kazuki back to a human being. Then, from the moon above a golden burst of light shines through the night sky. It is the shining of Kazuki's Sunlight Heart!