In 14672 A.D., the first year of the Demon Age, the demon lord Ryukotsuki escaped from hell and plotted to conquer the surface world ruled by the three Getsu brothers. The Getsu brothers fought against Ryukotsuki, each wielding one of the three spiritual Pulse Blades that have been passed within the clan for generations. However, the brothers were ultimately defeated by the demon and only Fma, the youngest of the three, survived. Vowing to avenge his slain brothers, Fma ventures into Kyki-t to recover the three stolen Pulse Blades and summon the spirits of his brothers to defeat Ryukotsuki.