Reborn as a woman named Aiko, the soldier rises as the military leader of a new crusade, successfully unites the world, and abolishes all religion. Haunted by memories of a past life, Aiko travels backward in time and finds herself caught in an incredible battle to save the future.

1212 AD. During the crusades, an innocent soldier finds himself betrayed, and leaps to his death, vowing to return as a fallen angel. Present day. Reborn as a woman named Aiko, the soldier rises as the military leader of a new crusade, successfully unites the world and abolishes all religion. Haunted by memories of a past life, Aiko travels backwards in time, and finds herself caught in an incredible battle to save the future.