Long ago, the great demon, Sephra tore Heaven from the sky and enslaved the gods. Since their liberation, their descendants have created new lives for themselves. Now their humble existence is threatened as Sephra's shadow once again looms over the world of Soror.

Sera, an unassuming young barmaid from a modest town is discovered to be the reincarnation of Celeste, an angelic hero of legend who perished before she could destroy mankind's ancient enemy over a thousand years ago. Thrust into the rushing current of destiny, she must put together the broken pieces of her past life and uncover the key to stopping Sephra once and for all.