Zip up and get your robot on! A new type of robot-action series! World-famous handsome mechanical engineer Koshiro Tatara and scary-looking musclehead Kaname, these polar opposite twins both fell in love with...

Somewhere in the desert lies the world's greatest treasure: the 12 Rings of the Dead, the only source of the mysterious substance Zombie Powder, which can raise the dead and grant eternal life. Into this world...