Five years ago, gravity-defying bubbles with mysterious powers rained down upon the earth. After a huge explosion of uncertain origin, Tokyo became ground zero, with the city being enclosed in a gigantic bubble. As a result of this Bubble Fall phenomenon, the metropolis that was once the capital of Japan drowned in a gravity-bending sea; the government declared it a prohibited zone, and the residents abandoned it. Children orphaned by the Bubble Fall now squat illegally in Tokyo, partaking in dangerous parkour team battles across the city's dilapidated buildings. Hibiki—a talented ace in these games with the ability to jump between bubbles—claims he can hear sounds from the Tokyo Tower. Determined to uncover its mysteries, he sets off toward the source, but he falls into the waters below. A strange girl, whom he later nicknames Uta, saves him. But little does Hibiki know that Uta's appearance in his life will reveal the secrets behind the disastrous event that changed their world forever.

Although citizens of London view dragons as a fairy-tale myth, statistics confirm that 72% of the city's deaths are caused by these grotesque beings. Unable to see them, the public is oblivious to their existence. However, in a mirror dimension to Front London, exists a place where dragons can be seen with the naked eye—Reverse London. Ninny Spangcole is a member of a popular girl group. But in Reverse London, she works as a Witch at Wing Bind—an organization that dispatches agents to exterminate the beasts and protect the citizens of both Londons using magic. Ninny and her partner, Noel Niihashi, in addition to their jobs, safeguard Baldo Ywain Parks, a young man with an odd connection to the dragons. Thanks to the Wing Bind's hard work, there were no fatal dragon attacks for almost a century. But the peace shatters when Baldo's presence unexpectedly causes a Dark Dragon to wreak havoc in the city. The witches are further inconvenienced when Ninny's troublesome former bandmate appears in Reverse London—in tandem with another powerful dragon.

The story is set in August of 2026 at the Fuji Training Facility. Natori Touko, a third-year middle school student in the Eastern Private Defense Academy, is entrenched in field training with instructor Kamiya. It has been a harsh training regiment, but it is finally the last day. Kamiya proposes a extracurricular class under the name Newest Weapons Research. But then, an incident occurs that rocks all of Japan.

The story follows the coming of age and Shinki battles of Tsubasa, a boy who dreams of becoming a Shinki Master, and his Shinki partner Arnval Mk. 2. (Source: ANN)