The Ezo Skydom, somewhere above the clouds. Edogaka Peninsula, Kingdom of Kurozaki Former assassin and revolutionary Rina Seiko is living a peaceful life as a Genji with her girlfriend Aya Hisagawa when she receives a strange letter bearing the royal seal. The incumbent Fox Empress, under strain from the new Minister of Defence, calls upon Rina's services to retrieve an important item called the Skystone Codex, an ancient tome that holds the secrets to the skies. But her true reason for summoning the former hitokiri runs much deeper. Powerful foes from fifteen years past seek the dangerous mysteries stored within this tome. The Staten Union, responsible for a terrible civil war that almost tore Kurozaki apart, is back in its airspace, hellbent on revenge. The power hungry Minister of Defence Yuichi Ono uses his own son Jigen as a pawn, citing him as a means to an end. And the supremely arrogant self-styled "Radiant Blademaster" Eisen Rast is obsessed with defeating the skies' strongest. Can Rina and her friends avoid getting roped into a political conspiracy, one that stretches back 25,000 years? Can Rina avoid tapping into her dangerous "White Demon" persona?