In the year M.C. 0089 in an intergalactic realm known as Sol Star, there are twin brothers, Apollo and Ares and a younger sister named Athena, who are the Soleanna siblings that owns a failing interstellar salvaging business on Planet Dezora to help finance their friend Saya. Just when their financial woes are taking the turn for the worse, the Soleanna siblings stumble across a strange set of high-tech armor that endows the user with spectral powers. Hoping to make a living of being a hero, Apollo volunteers to transform into the Full Metal Specter and help do missions as a freelance hero.

However, this puts a target on their backs as several factions take note of Apollo using his newly founded power to challenge the establishment that rules over the galaxy with an iron fist. Not only do the siblings have to deal with taking care of their friend Saya and taking on the galaxy, but solving the mysteries surrounding the spectral hi-tech armor.