Demon God's Tragedy and Revenge

At the end of time, the universe shrinks and breaks apart to create two realms: the heavenly realm and the mortal plane, also known as "Yggdrasil" by the gods who reside there. The gods, including the six "heavenly stars," lived in the heavenly realm. However, one day the heavenly realm became dark and the skies turned red as the Demon god was born.