In a world where more than just angels and demons exist, multiple people have begun to fall ill to a new disease known as Opio. The disease renders those infected unable to function, slowly killing them from the inside-out. Many died after the illness spread across the lands. After about a year of suffering, Opio died out, leaving those who were ok without many friends and family.

With Opio gone, a new problem forms over the land everyone knows as home. Ever since this floating city came into being, bright stars began to fall from the sky. As these strange occurrences keep popping up, a band of heroes come into light. Without even knowing it, these select few find themselves thrown into a destiny they may not survive. Will they completely wipe out the evil that haunts the world?