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]

Kouichi Sanada and Kazuki Aihara's childhood friend Mao Mizusawa has returned after living in France for a couple of years. Kouichi is surprised to learn that, since her parents are remaining overseas for the time being, his mother has agreed to let Mao stay with them. The three friends help each other deal with the ups and downs of high school romance.

"Mine has been a life of much shame."

Tokyo, 2036 (Showa year 111): a revolution in medical treatment has conquered death...
By means of internal nanomachines and the "S.H.E.L.L." system whose network controls them, human beings suffer no diseases, require no treatment for injuries, and are guaranteed a 120-year lifespan, free from illness. Yet this consummate social system warps the Japanese nation in a host of ways: unresolved economic disparities, ethical decadence resulting from deathlessness, grave environmental pollution, and the "Human Lost" phenomenon, in which people themselves, disconnected from the S.H.E.L.L. network, become malformed. Japan teeters wildly between two potential futures: civilization's restoration or its destruction.

Atmospheric pollution suffuses "Route 16" in the Outside—the area outside the Route 16 beltway. Youzou Oba, who lives an idle, drug-saturated life, joins Masao Horiki, a mysterious man who associates with the drag-racing gangs, on an incursion Inside—the area within the Route 7 loop where the privileged class lives—only to be embroiled in a violent struggle. When he encounters a malformed sufferer of the Human Lost phenomenon, a "Lost," Youzou's life is saved by Yoshiko Hiiragi, a girl of mysterious abilities who belongs to the anti-Lost agency H.I.L.A.M., and he discovers that he himself also possesses extraordinary powers...

Degradation and death. Life and hope. Buffeted by fate, a man tears himself apart and cries out. Rage. Sorrow. Pathos. Consumed by despair and bitter tears, Youzou Oba is himself transformed into a demon. A human lost... or a human who can find himself? 

(Source: Official Site)

In the year 2199, Earth faces its greatest crisis. Due to unrelenting bombings by the alien race known as "Gamilas," the planet can no longer sustain its inhabitants. In exactly one year, humanity is set to become extinct. In desperation, the people of Earth establish the Earth Defense Force, their last defense against the power-hungry Gamilas Empire. However, humanity finds a glimmer of hope after receiving a message from the mysterious planet Iscandar, which offers them a device that would restore Earth to its former glory. With salvation in sight, the Earth Defense Force calls on the prolific Space Battleship Yamato and swiftly assembles a crew to make the 168,000 light-year trek to Iscandar and receive their aid. Among the crew are young officers Susumu Kodai and Daisuke Shima, along with several other newly promoted leaders, all under the command of the distinguished Captain Juuzou Okita. Forced to learn how to handle the ship's innovative technology while dealing with the onslaught of Gamilas fleets, the inexperienced cast of Uchuu Senkan Yamato 2199 must summon every inch of their resolve to survive the many hardships aboard the Yamato and complete their mission: to save humanity before it's too late. [Written by MAL Rewrite]