The Lost Daughter of the Demon King and Music Demon (WTDSIK AU)

The Netherworld, a world filled with demons born with magic, strength and many more of their capabilities in for demons who lived there.

Amduscias Poro, who was known as the 'Legendary Sound Demon' who once stalled an army for 666 hours with his music. The Demon King, Derkila, he forged his demonkind from a new path of nothingness to rivers in the sky, as well as the magma and flower gardens, that eventually formed to become what the Demon World consists for the future.

Derkila and Poro lived a happy married life in the Netherworld as their love grew, their child soon became born within the tower walls. However, an attack had happened inside the Babel Tower leading the newborn princess going missing after that. Grieving at their daughter's disappearance, they searched far and wide to find her for a very long time until they had lost hope to that day.

After that, the Demon King Derkila went missing as well, leaving the Sound Demon in pain as the two people loved got taken away from him. As the years went by...a certain blue-haired girl came to the Netherworld after being sold by her 'parents', or so she thought they were.

Iruma Suzuki, a girl born with so many secrets behind her past, starts having the adventure of a lifetime in her adopted grandfather's school Babyls, until one day, the secret behind her birth and past would be revealed soon to not just her school, but the whole Netherworld as well.

How would she and everyone react? Let's find out!