Welcome to PLANET OF METAL, located at the edge of the galaxy.

A mysterious curse is causing the creatures here to go berserk.
According to legend, this curse comes from a Mecha Skull hidden on the planet.

ASTERISM, along with Zom-chan, a zombie they rescued during their travels, set out to stop the curse and bring peace back to the desolate planet.
However, their journey is impeded by monsters influenced by the Mecha Skull.

The battle to control the Mecha Skull and save the planet’s core essence, its metal soul, is about to begin.