Turning the clock back a hundred years, AIs are already an integral part of human society, programmed with specific missions meant to be carried out for their entire course of operation.

In a desperate bid to prevent the calamity from ever occurring, a scientist bets everything on a remnant from the past.

When highly evolved AIs set out to eradicate mankind, the carnage that ensues fills the air with the stench of fresh blood and burning bodies. As they grow closer, the two strive to support one another amid their struggles to forge a future for themselves. Shortly after they arrive in Tokyo, the girls cross paths again due to an unexpected coincidence that ultimately leads them to live under the same roof. Though heartbroken, Nana bravely looks forward and travels to the capital with the ambition of becoming a recognized artist. Meanwhile, her namesake is a solitary punk vocalist whose impassioned romance with her band's bassist, Ren Honjou, comes to a sudden end. Without letting herself be dismayed by Shouji's decision to study in Tokyo, Nana works hard to earn enough money and follow him there. The former has a cheerful and friendly nature, but her naivety has steered her romantic life astray until she meets her dependable boyfriend-Shouji Endo. With their hearts set on going to Tokyo, Nana Komatsu dreams about blissful love, while Nana Osaki aims for a successful music career. Departing from their respective hometowns, two young women with identical names are brought together in their pursuit of new beginnings.

Dancing fat bear pencil animation