Signal, a robot companion built for Nobuhiko, is attacked by Pulse, one the its creator's previous prototypes. Reprogrammed by Dr. Otoi's mysterious rival, Pulse is loaded down with weapons and sent on a mission by Otoi: steal the most recent robot technology, and obliterate anything that gets in his way.

Eccentric prince and wannabe adventurer Muscat Tyler embarks on a secret tour of his vast empire, accompanied by two of the galaxy’s strongest fighters: Ruu, a powerful young elf, and K.K., a mech-clad rogue. A crash-landing puts the newly formed group on the trail of a historic treasure on a strange planet, testing their abilities — and their patience for each other.