As a final measure, Sin infiltrates Nerville’s body, dodging relentless waves of pursuing Nerville cells as he searches for Unika. Their ultimate target: Nerville’s heart. The battle proves to be an uphill struggle, but just as the tide turns against them, reinforcements arrive—Dizzy, Ky, and the combined power of every Gear on Earth.
The future version of Nerville has evolved into a being that can even harness Gear cells. Sin, Sol, Jack-O’, Baiken, and Johnny find themselves battling relentless swarms of falling Nerville cells. Across the world, the fight rages on, with every front facing overwhelming odds. Desperate to turn the tide, the group devises a daring strategy… Meanwhile, Bridget is gravely injured in the battle against the Nerville cells. Seeing her wounded savior, Unika’s eyes burn with newfound determination.
Sin goes berserk under the influence of the virus. Sol manages to bring the situation under control by firing a Gear cell suppression device, but not before their allies are wounded and the world is thrown into chaos. Why did Nerville, a man from the future, resort to such extreme measures? And how was he able to manipulate time itself? Behind it all lurks the presence of Axl, a being who can interfere with causality across time.
Unika finds herself shaken by Sin’s words, despite seeing him as her enemy. After spending time with Bridget, doubt begins to creep into her heart. Meanwhile, Sin reaffirms his resolve to find a path where Gears and humans can coexist. But just as he takes his next step, Nerville sets a deadly trap in his pursuit to eradicate all Gears. The battle is about to take a new turn.
Wounded and exhausted, Unika is tended to by Bridget, who had been camping out under the night sky. While relieved that Illyria was spared from destruction, she still struggles with the weight of having defied her father. Meanwhile, Sin, also badly injured, regrets his reckless actions, realizing they nearly put Illyria in grave danger. But he’s not the only one consumed by regret...
Sisters Ramlethal and Elphelt are artificial life-form known as Valentines. On a mission to uncover the truth behind the chaos at Illyria Castle, they press forward with their investigation. Meanwhile, after an encounter with the anti-Gear faction leader Nerville, Sin and his allies search the slums for Unika's whereabouts. Just then, Jack-O' contacts them with a crucial revelation: "We know Unika’s next target."
Sin sets off on a journey with Sol in pursuit of Unika after her attack on his parents' wedding. Their destination: Washington, D.C., where the End of War Commemoration is underway. Just as expected, Unika strikes during the commemoration. Amid the chaos, the bounty hunter Bridget and the one-eyed swordswoman Baiken join Sin in the fight, turning the venue into a battlefield. As Sin and Unika face off, a buried memory resurfaces in both of their minds...
Sin Kiske is the son of Ky, First King of Illyria, and his half-Gear mother, Dizzy. Determined to witness his parents’ long-delayed wedding, Sin makes his way to Illyria Castle. Previously considered forbidden, the union between a human and a Gear is celebrated with joy. But amidst the blessings, a mysterious girl suddenly appears…
