As you wander around the heavenly world of bliss, you seem to notice a mountain that looked different than every other mountain. You went there and saw signs labelled "GET OUT", "DON'T SET HER FREE" and "ALL HOPE IS LOST", surrounding the big and deep hole, then you suddenly trip and fell in...

You wake up hours later and you stumble yourself in a dark and soulless forest. as you wander around cluelessly, you heard something dash nearby, who was that...? Was it some sort of entity? The entity charged towards you, you dodge the attack and ran away. The entity didn't like that her prey ran away...

Where are you, my sweet little prey...? Come out where you came from... Hahahaaa!~

That girl seems to be the Demigod of Darkness: "Kuro"