This is the story of Mito Mitsukuni in mecha style. Prince of the Edon Star, Edward Mito begins a trip to the galaxy with his servant Baron Kalkus, Duke Skead and the ninja girl Shinobu. Under the false identity of Bocchan, Suke and Kaku they help the oppressed people and fight with the super robot Daioja.

In the new, whimsical era of Battle Spirits, cards have become scattered across a colorful galaxy, enticing all card questers to duke it out in search of the strongest cards. Rei is a flamboyant wanderer who is obsessed with being on top. Accompanied by a small dragon named Mugen and a talking robot named Salt, the self-proclaimed Number One Star regularly engages in card-gaming mischief through flashy battles. One day, Rei meets Raira and Rikuto April, both of whom seem to have clues on the whereabouts of the ultimate Battle Spirits card. Together, they embark on a quest to search for the card, clashing with many vibrant personalities along the way. Soon, their adventure catches the attention of the Guild, wily villains who are also set on obtaining the Ultimate Battle Spirits. In contending against the Guild, Rei's status as number one is put to the test—an endeavor that will slowly unveil secrets regarding the fate of the universe.

In the year 2020, a nation faces the pervasive threat of the Others—mysterious monsters who fall from the sky and feed on human brains. At the same time, psionics, a hormone that gives certain people extrasensory abilities that are effective against the Others, is discovered in the human body. Subsequently, the nation's founder establishes the Other Suppression Force (OSF) to combat these monsters and save humanity. Commonly referred to as the Scarlet Guardians, young individuals with psionics undergo intensive training to join this group. One day, the nation prepares an induction ceremony for the exceptional recruits who completed the grueling training to become Scarlet Guardians. Among these young elites is Yuito Sumeragi, the determined son of the nation's founder; at the age of five, he was rescued by a woman in the OSF. To repay this debt, he joins the organization, eager to put his training to good use. As he meets his new comrades, he faces a big problem—the woman who saved him years ago closely resembles one of his teammates. However, this should be the least of his worries—unbeknownst to him, a conspiracy is brewing, one with the capability to shake the entire country.

A strange environmental phenomenon 22 years ago in the Kanazawa prefecture caused the land to split and protrude upwards reaching unprecedented heights, creating the secluded area known as The Lost Ground. Kazuma is a young mercenary who lives in the Lost Ground, looking for any work he can find to sustain his livelihood within the harsh environment. He is one of the few people that are gifted with the Alter ability, which allows him to plaster his right arm and torso with a metallic alloy. When this mercenary encounters HOLY, an order whose purpose is to suppress and capture what they call Native Alter Users, and one of the elite members of HOLY, Ryuho, an epic rivalry begins. (Source: ANN)