Buso Renkin

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 Sunlight Heart to pieces.

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. Papillon theorizes that Kazuki transformed due to his becoming a medium between Victor and humans. Bravo returns to HQ in order to learn more about Victor, Kazuki's transformation, and the black kakugane, as well as to figure out what really happened a hundred years ago.

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. At the same time, Kazuki meets up with Bravo for further training but instead is told the surprising truth: In the past, the Alchemist Warrior Victor was a test subject for the Alchemist Army's breakthrough, the black kakugane. However, the result was the creation of a monster more powerful than a homunculus. And like Victor, with the black kakugane embedded in his chest, Kazuki will, in six weeks, become a cursed monster whose mere existence will spread death.

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. Gota, who has harbored feelings toward Tokiko since their days in training, is stricken with grief. As Gota wanders alone, he comes across Warrior Chief Hiwatari and his team who are there to confirm Kazuki's death and retrieve the black kakugane. Upon learning of Kazuki's survival, Hiwatari declares Tokiko's action a betrayal of the Alchemist Army.

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. Warrior Ikusabe, stays behind to fight off Papillon. Papillon attacks with his Near-Death Happiness, but no matter how much damage Ikusabe's body takes, his Buso Renkin allows him to instantaneously regenerate. Against an enemy with restoration ability far superior to that of a homunculus, does Papillon stand a chance?

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. Thanks to Shusui's Sword Samurai X and Chitose's Hermes drive, the team narrowly escapes imminent doom and is forced to retreat. As Kazuki searches for Tokiko and Gota, a shadowy figure appears. The man determined to make the kill is none other than Captain Bravo. With no words exchanged, the final showdown nears.

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. Using Silver Skin Reverse to restrain Kazuki, Bravo instead catches Gota who, along with Tokiko, has come for Kazuki. By placing himself between the Silver Skin and the target, Gota breaches the Reverse attack, and Tokiko pleads with Bravo to give them time to find a way to nullify the black kakugane.

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. Before being engulfed by the flames, Bravo sacrificed himself in order to save them. Kazuki and Hiwatari clash, but a tattered Silver Skin stands before them. Is Bravo still alive? Then the Alchemist Army's Great Warrior Chief Shosei Sakaguchi orders Hiwatari to suspend Kazuki's re-extermination and join him for the final battle against Victor.

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. Meanwhile Kazuki, Tokiko, and Gota meet up with Papillon and Gozen at Newton Apple Academy for Girls. To everyone's astonishment, Victor's wife Alexandria and their daughter Victoria greet the group. The two explain that for the past hundred years, they have been researching a way to reverse the effects of the black kakugane, which has turned Victor into a monster.

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. Still unsure, Kazuki and Tokiko return to their friends in Ginsei City, where they celebrate summer break by going to an amusement park. When thinking of the smiling faces of his friends, Kazuki already knows what his decision is.

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. Though a temporary measure, it means saying goodbye to Tokiko and friends. Soon Kazuki heads to the battlefield where the Alchemist Army is fighting Victor, where he and Tokiko impale Victor's body with the white kakugane. But Victor does not revert back to his human form!

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. Soon, after thinking through what she could do for Kazuki, Tokiko comes to the conclusion to challenge Papillon to carry out the promise Kazuki made with him.

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! Convinced of Kazuki's survival, the Alchemist Army takes Tokiko on the Buster Baron toward the moon. Kazuki and Victor have continued their battle over the past month. Victor halts the battle when he senses the approach of the Buster Baron, and a being covered in the Silver Skin flies out into open space. The being is Tokiko, who has come to rescue Kazuki.