In the follow up to Shirow's classic anime, Al, Leona and their trusty steed, Bonaparte, continue to fight crime in New Port City, alongside the rest of the Tank Police. But a new threat appears in the form of a series of terrorist attacks, using the latest weapons technology. The Tank Police are out-numbered and out-gunned, but Al and Leona set out to discover who or what is behind these attacks. With massive explosions and high-speed chases, Leona often causes more damage than the criminals she pursues.

The alien Wulgaru's last assault against humanity was foiled by the heroic actions of the genetically enhanced humans known as the Evolved Children in their advanced AHSMB battle armor, but now a new attack has been launched against Earth under an even deadlier champion, Diorna, created from the fusion of DNA from two Wulgaru Royals. Unfortunately, Izuru Hitachi, the leader of Team Rabbits who defeated the Wulgaru Royal Jiart, is still out of action and recovering, so the task of marshalling the Majestic Princes and stopping Diorna falls upon the unready shoulders of Toshikazu Asagi. Together with the remaining members of Team Rabbits and the recently created Team Fawn, it’s up to Asagi to hold the line against the most ruthless adversary yet.

Ayato Kamina was separated from the girl he loved, Haruka Mishima, when an event occurred that was thought to have killed everyone outside of Tokyo. But one day three years later, invaders suddenly attacked the city. It was then that he meets an agent of TERRA, Haruka Shitow, who tells him that she will give him the truth about the world. It is the beginning of a series of strange events, which involve him activating a giant mecha, the RahXephon and finding out that many people, including his own mother, has blue blood, and that he was actually living in a self-encased dimension where time moves slower than that of the outside world.

Prequel to the TV anime series revolving around the "origin of the dream."