Bakugan Interspace has gone active all across the Earth, and kids are having fun testing their skills against Dan, Shun, and Marucho. However the Brawlers soon learn some Bakugan were sent into an alternate dimension when Vestroia became six different groups. These Bakugan are now at war with each other as the Gunadlians and the Neathians fighting for control of their dimension and looking to recruit the strongest Earthlings to their cause. The Battle Brawlers must noe fight to keep Interspace free of politics while deciding whether or not they should participate in this new found war.
Bakugan Interspace gets messy when Dan learns his battling directly threatens Earth. Dragoâ€™s exposure to Code Eve has infused him with incredible power and as a result Dan accidentally releases Mechtogan, a new mysterious entity that wreaks havoc whenever Drago battles! While Dan attempts to regain control over Dragoâ€™s new powers, an insidious enemy builds an army of â€œDark Bakuganâ€ engineered for total world domination.
One sunny day invaders came from space. They weren't little green men or funny girls wearing school uniforms, though. They were ugly robots which defeated the UN forces in seconds. After that the invaders (known as "eyeballs") roamed around and observed human society. In fact, they were peaceful unless attacked. They were polite and followed all the traffic laws, too. Still, they were aliens and the people of Earth wanted them to go home. The Kitanohashi High School Magic Club took it on themselves to defeat these foul robots and free the world.
It is Tokyo, 1969. Earth is under the attack of the "Invaders." Fortunately, though, the public is unaware of this. But to the secret orginazation, A.E.G.I.S, the threat is very real, and it is up them to stop this invasion. One day on his route to high school, Ukiya Shun observes a battle between a young girl and a group of Invaders. He ends up helping her and discovers that, much like the girl, he possesses the ability to generate a "gate" of special power that only a few other people are gifted with. As a result, Ukiya then joins A.E.G.I.S in an effort to recruit other Gate Keepers and protect the city, all while doing his best not to imitate his late father, whom he dispises.
Thirty-two years have passed since the initial defeat of the Invaders. A.E.G.I.S is all but dismantled now and has become an underground organization consisting of only a few Gate Keepers left to save humanity. One of the members, Ayane Isuzu, is sick of society as a whole, though she continues to defeat the Invaders out of spite for her father. Suddenly, she learns of the revival of Machine General (Kikai Shogun) and Devil Count (Akuma Hakushaku), but a mysterious ghost girl now accompanies them. It is up to Ayane and the remnants of A.E.G.I.S to stop them and save humanity once again.
Based on COLOPL's school action role-playing game. Set in the year 2045. The world has been contaminated by Irousu (mysterious invaders who suddenly appeared), and humans find themselves restricted and contained. Standing boldly against these invaders are ordinary girls everywhere, without a powerful army or even weapons.
The Shinjugammine Girls Academy is a school for these "Hoshimori" (Star Guardians) destined to fight the Irousu. The player is assigned to this academy to train the girls and take back the contaminated Earth. And so, once again, the chimes echo through the sun-strewn schoolyard to mark the beginning of classes today...