In the future (subsequent to the events of the television series) Kate, Rose, Rachel and Claire divide their immortal lives between study and vigilantism. Their past link to the red garden on Roosevelt Island comes back to haunt them after mysterious transfer students Louise and Edgar seek out their friendship.

Twenty years prior to the story's beginning, an asteroid headed for Earth destroys Pluto. Due to Pluto's destruction, the asteroid, which is dubbed Thanatos, becomes temporarily stagnant. Now, in order to avoid Earth's impending destruction, the International Solarsystem Development Agency (ISDA) works on the "D-Project", and creates the "Dragonaut" after finding a dragon egg under the ocean. This weapon's primary purpose is to destroy the asteroid when the time comes. However, they soon find out that the asteroid is not their only threat, as powerful dragon-like creatures, which are bent on destruction, appear on Earth. After witnessing a murder by one of the creatures, Jin Kamishina, a lonely 18-year-old boy who lost his family in a shuttle accident two years ago, gets involved in the mysteries of the dragons and becomes the chosen pilot of the Dragonaut. Helping him on his journey is Toa, a mysterious girl who saves him from falling to his death after the creature attacks him. As they get deeper into the mysteries of the dragons, they encounter new friends and enemies, and also begin to develop a closer relationship. (Source: Wikipedia)

Otaku siblings Tamotsu and Niwaka Denkigai are shopping in Akihabara when it is overrun by vampiric cosplaying monsters! These creatures, known as "Bugged Ones," can possess anyone they bite and soon they begin causing mayhem across the city. As Tamotsu finds himself at the mercy of one of these creatures, he is rescued by the mysterious baseball bat-wielding Matome Mayonaka. Together, they fight through several more encounters with the Bugged Ones, but before long, Tamotsu is fatally wounded protecting Matome. With no other choice, she revives him as a high level Bugged One—just like her! Tamotsu and Matome, along with excitable otaku cosplayer Arisa Ahokainen, make up the group "The Electric Mayonnaise" and they begin dispatching the Bugged Ones in the only way they know how: by ripping off their clothes and exposing them to sunlight! [Written by MAL Rewrite]

15 children, 8 boys and 7 girls, are enjoying their summer camp together when they suddenly discover a grotto by the sea. When they enter the mysterious place they find a room full of computers, as well as a man named Kokopelli, who introduces himself as the owner. He claims to be working on a game which involves a giant robot that has been designed to protect the Earth from 15 different alien invasions. Kokopelli hasn't been able to test the game yet, so he persuades all but one of the children to sign a contract in what he claims will be a fun adventure. However, as soon as the contracts are signed things start to take a much darker turn. In Bokurano, the children must now pilot the giant robot Zearth one at a time in the hopes that they will have what it takes to defeat all of the upcoming enemies. But Kokopelli has left out one very important piece of information: the giant robot Zearth's energy source.