JiaXing1
The brilliance of Sento Kiryu, Kamen Rider Build, once saved the world from the cosmic horror of Evolto and his destructive agent, Killbus. But now, a new, terrifying threat descends from the stars: a mysterious alien force with advanced technology and unknown motives. Their arrival plunges Touto into chaos, overwhelming conventional defenses and turning familiar cityscapes into alien battlegrounds.
Humanity's first line of defense is a desperate and outmatched local SWAT unit. Once again, the fate of the city falls to Sento and his partner Ryuga Banjo, as Kamen Rider Cross-Z, who must confront this extraterrestrial invasion head-on.
However, the sheer power and adaptability of the alien invaders soon push Build and Cross-Z to their limits. Recognizing the unprecedented danger, and with the fate of the planet hanging in the balance, Sento is forced to consider an unthinkable alliance. To gain the knowledge and power needed to combat this new enemy, he must seek out and potentially work alongside the imprisoned remnants of Evolto and the cunning Killbus.
This uneasy truce will test Sento's morals and the trust of his allies. Can he truly rely on the architects of Earth's near destruction? What price will he have to pay for their cooperation?
Joining their fight is Chika Ono, a seemingly ordinary individual whose unexpected connection to the virtual world unlocks the power of a new Kamen Rider. Together, this unlikely alliance must decipher the aliens' goals, expose any human collaborators, and navigate the treacherous dynamic of working with their former enemies.
As the alien front intensifies and the lines between friend and foe become dangerously blurred, Kamen Rider Build and his comrades find themselves in a desperate battle for the survival of their planet, forced to make impossible choices in Kamen Rider Build: Alien Front.