Ten years ago, Slade Wilson-aka the super-assassin called Deathstroke-made a tragic mistake and his wife and son paid a terrible price. Now, a decade later, Wilson's family is threatened once again by the murderous Jackal and the terrorists of H.IV.E. Can Deathstroke atone for the sins of the past-or will his family pay the ultimate price?

The story of the film begins after the events of the second season, at the graduation ceremony of the third-year students. Knowing that the graduation of the third-year members means the end of u's, the nine girls take a walk around the school filled with memories. However, when the students attempt to leave the school gates, a single email is sent to them, and the curtain on a new story for u's begins.

One day a young woman named Blanca is saved by Xuan, a snake catcher from a nearby village. She has lost her memory, and together they go on a journey to discover her real identity, developing deeper feelings for one another along the way. But as they learn more about her past, they uncover a darker plot of supernatural forces vying for power, with the fate of the world hanging in the balance.

In 2046, many aspects of life are carried out on a virtual network. No matter how advanced the time becomes, however, bullying never disappears. Haruyuki is one of the bullied students. However, one day he is contacted by Kuroyukihime, the most famous person in the school. "Wouldn't you like to 'accelerate' and go further ahead, boy?" Haruyuki is introduced to the "Accel World" and decides to fight as Kuroyukihime's knight.