Activate the Heaven System at the Beginning

Musu, who traveled to a parallel space, discovered that monsters appeared, which was completely the first world where monsters resurrected. Turn on the heaven system, and the world will tremble for me. Are you struggling to defeat monsters? I can destroy it easily. Beauty, how can you bear my beauty? Whoever refuses to obey, I will beat you until you obey. Many years later... Big demon? You can only be my slave! Demon God? Just my little brother! I am the Lord of Heaven. If you want to become a god, you need my consent...