A baby named Olivia is discovered by the enigmatic Z in a temple within the Forest of No Return. Raised by Z, a deity of death, Olivia learns worldly knowledge, combat skills, and ancient magic until Z vanishes one day. Armed with a powerful ebony blade, Olivia ventures beyond the forest in pursuit of Z. Meanwhile, a brutal conflict unfolds between the Asvelt Empire and the struggling Kingdom of Fernest. Offering a grim gift of imperial heads, Olivia joins Fernest's army and showcases her prowess in battle, potentially becoming their saving grace. Yet, her brusque nature and rebellious streak challenge her acceptance. As Olivia strives to alter the war's course, the looming question remains—will she reunite with Z amidst her journey?