Concerned about Aoto's emotional disconnect, Akane and Midori look him up on the academy server, but his information were classified. Determined, the two steal Undine's access pass and finds out that Aoto is a suspect of the Blue Christmas massacre.

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.

After escaping Shakespeare's divine play, Akane, Midori, and Aoto find themselves inside the zone. Aoto already holds the key to the Gate, but Akane and Midori do not. Unfortunately, Loki already has that figured out, and great tragedy awaits the two.

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...