It's the first day of the new school year. 5th grader Ari and her best friends Suha and Min have started an after school activity called the Problem Solving Club. However, no one seems to have any problems that need to be solved. Disappointed Ari ends up discovering an unconscious hamster on the road. Amazingly...the hamster begins to speak. "I must find the magic ring..."

After returning from the feuding realms of Gundalia and Neathia, Danma Kuusou and his companions continue their lives on Earth. Now, a year later, the virtual reality world of Bakugan Interspace has finally recovered from the alien invasion and has once again become a place for brawlers to gather and challenge themselves. It turns out, however, that whenever Danma's Bakugan, Pyrus Dragonoid, unleashes his might in battle, the Interspace experiences new disruptions. Unable to harness the incredible powers granted to him by Code Eve—the Bakugan Mother spirit—he struggles to maintain control over the Mechtogan contained within him. When it goes out of control, the mysterious mechanical entity wreaks havoc on the battlefield, attacking friends and foes alike. To make matters worse, Bakugan Interspace is at risk of being infiltrated again. An unknown mastermind is sending mutated Chaos Bakugan into the system in order to brainwash brawlers and take control of the virtual realm. In anticipation of the inevitable confrontation, Danma must find a way to keep the Mechtogan's destructive force at bay and rally the Battle Brawlers once again. [Written by MAL Rewrite]

Five supernatural factions have been fighting against each other for who knows how many centuries, with the beginning of Aquarian Age always in mind. Kyouta, soon begins to see visions of mystical girls fighting, except they do exist. Soon he and his girlfriend Yoriko become involved and the battle for Earth and Aquarian Age lies in their hands.

Seventeen-year-old Marco Polo leaves his home in Venice on a trip to the little-known country of "Yuan", in the company of his father Nicolo and his uncle Matteo. Their mission is to deliver the sacred oil from the Tomb of Christ and a letter from the Pope to the Kublai.