After a decade away from home, Azuma Kazuki could not have imagined what awaited him upon his return. He had no idea that dozens of heavily armed men would ambush and seize him as a captive. Luckily, his imprisonment was brief. Armed with an odd sentient weapon called "Bubuki" strapped to her right arm, his childhood friend Kogane Asabuki arrives to rescue him.
Once free, Azuma discovers he too can command Bubuki. With new allies, he must awaken the Buranki titan Oubu, dormant deep beneath the earth. Armed with this knowledge and resolve, a fresh path to uncover the Buranki"s secrets lies ahead for Azuma in the future and beyond.
