On one rainy day, an Adapter attacks the passengers on a tram. Luckily, Aoto, another Adapter who was at the scene, stops him with his ability. Akane and Midori are ordered by the Academy to recruit Aoto, but they hear a disturbing rumor about him.

For Akane, his father meant the world, so he cannot understand why Aoto would kill his own parents. However, Aoto does not share his story either. The colliding two run into each other later, when a patrol Driver suddenly starts to malfunction.

Arthur finally decides to go find the Divine Gate. He asks the members of the Knights of Rounds as well as the select few from the Academy to join him on this expedition. However, Loki and Oz set out on their own mission as well in response.

Lead by Arthur, the Knights of Round and the Adapters from the Academy head for the Divine Gate. Arthur explains that his wish is to destroy the Gate and return the world to its original state. However, Loki and Oz stand in their way to stop them.

With "despair" being the key to the Divine Gate, both Akane and Midori's loss of their significant person tragically gives them access to the Gate as well. However, Aoto is up for more despair as he faces his twin brother, Ariton.

Led by the spirit of the key, Akane, Midori, and Aoto reaches the front of the Gate. There, the Key gives them the option to choose their own fate. However, they quickly learn that the Divine Gate is much more than just something that grants wishes...