Nathan Grant, an Aussie student at Warrawul Boarding School, has a pretty normal life. A chance encounter with a flesh-eating Homunculus turns all that upside-down! Savagely killed by the creature, Nathan is brought back to life by the Alchemic Warrior, Astrid Rachelle. In so doing, she bestows upon him the powers of the Arms Alchemy: his soul in weapon form. Determined to use this power to its fullest value, Nathan joins Astrid on a hunt for the Homunculi infesting his town, before his friends and sister become lunch.