Harem Overlord

"You remember me. I was just obliged to say that since there is no way you will forget about me." The darkness retracted back as a laugh was heard.

"Who is he?" Mia asked as she stared at the eyes. She wanted to release her cultivation and use her powers but for some reason, her body wasn't obeying her commands.

"Don't even try using your powers as it is a futile attempt. Inside this place, every single person will be under his command and there is nothing you can do about it." Kai replied to Mia as his closed his eyes.

"Aww, you are going away so soon. But anyways, we will met again some day and this is something you should know, the cage has a permanent crack in it and I will definitely destroy it before you find your powers back."

The voice said again as dark tendrils of power wrapped around Kai's body.

He called upon the power of The Darkness as everything around him shattered. The three of them appeared back in the house as Kai took out a bed from his pendant and sat on it.

"That was a demon." Kai said to Mia and Mariel as their surroundings changed once again.

This time, Kai played one of his own memories even though he was not present in them. Instead a young boy was crying in the corner alone. He slowly lifted his face as he heard someone calling his name.

Shockingly, his eyes were completely black. Mia and Mariel were not shocked by this since they knew how demons looked. The boy as if hypnotised by a melody was running in a certain direction.

He reached a place where an endless hole was present in the ground. He peered into it as his eyes suddenly started to hurt. Blood started to appear in the middle of his eyes as the boy screamed in pain.

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After an hour, the blood froze in the middle eyebrows and formed a blood red iris. The boy then rose in the sky as dark blue flames surrounded his body. The boy then vanished with a storm of blue flames as the trio came back to the real world.

"That boy was an abandoned demon who hated fighting which was something expected from every demon as they are muscle heads. But the boy hated fighting and he wanted to become the ruler of the demon clan to make the demon realm a peaceful place to live.

But he was only a common demon who singled out by other demons. His lover left him for another demon and nobody would even look at him. That kind of thing gives trauma to a child whether he or she is a demon, human or a spirit." Kai said as Mia and Mariel also sat down.

"In the demon realm, there is a place known as the abyss which exists and doesn't exists at the same time. Many people belive that the abyss is the end of the realm since no one can see it unless the abyss calls them. But it's not the end of the realm. It's a prison that holds Azazel, the first and last angel who fell from the celestial realm." Kai said in a grim voice as he drew symbols on the air.

They showed a person with wings falling from the clouds as he struggled to regain his balance.

"But the archangels and the supreme deity, the ruler of the celestial realm, didn't allow him to escape. They fought him and sealed him inside a prison." Kai drew four figures in the sky who fought the falling figure as they trapped him inside a cage.

"But Azazel didn't give up. He tried to destroy the prison using his superior cultivation but he wasn't able to do so. His powers were so great that the spiritual energy started to leak from the barrier and took the form of a realm.

The demon clan settled on this realm and it was then named as the demon realm. As for Azazel, he overused his powers and was forced to go into deep slumber." Kai said as he continued to draw.

He depicted Azazel trying to destroy his cage and how spiritual energy leaked from the cage. The spiritual energy then started to gather and a new realm was born.

A few years later, the demon clan appeared and settled on the this realm whereas Azazel went into slumber.

"But after sleeping for a few centuries, Azazel woke up and found out that there was a crack in the cage. But that wasn't enough for him to leave so he could only call someone from the outside. He tried it with a demon but he didn't even listen to him. And after a few days, the crack was completely healed and Azazel could do nothing except wait." Kai said as he drew a sleeping Azazel who suddenly woke up.

He showed how Azazel found the crack and used it to ask a demon for help him. But the demon straight up thought that he was having a bad day and rejected Azazel.

"After that, a crack would appear on the cage after a few centuries but it would close the moment Azazel contacted someone on the outside. Azazel started experimenting on it and found out that the crack would only close if he contacted someone on the outside.

So he just watched the outside world, waiting for the perfect vessel for himself. And after waiting for a few millenium's, Azazel finally found the perfect demon he could manipulate." Kai said as Mia nodded.

"It was the boy you showed to us earlier." Mia said as Kai nodded.

"Demons and angels can enter the bodies of other living things but they need their permission to do so. But instead of going through with all that drama, angels and demons usually choose people who are about to die so that they could get a yes easily." Kai told them before continuing the story.

"Azazel promised the boy that he will make the demon realm a better place to live and since the boy was heartbroken and alone, he said yes to Azazel. But when Azazel entered his body, he destroyed the boy's soul and became the sole inheritor of the body.

The reason Azazel chose that boy to be his vessel was because of the boy being am outcast to his own people, just like Azazel. This happened around the time I was meeting the demon queen and that's when I first met him." Kai said as the drawings vanished.

"I might as well show you our encounter." Kai said as their surroundings changed once again

"That's me and the current, or previous as I don't know who is currently ruling the demon clan, demon empress Rias." Kai said as he pointed at himself and the demon empress Rias.

The younger version of Kai looked exactly like the current Kai. Beside him, a young girl with complete red eyes and blonde hair was standing with a serious expression.

"Why are you both so serious?" Mia asked as she was confused by their behaviour.

"Just wait and see." Kai replied.

After a few seconds, a swirling storm of blue flames started to rise in front of the younger Kai and Rias.

From inside the storm, a handsome man came out with an evil grin. He had blue hair and shining golden eyes.

"In the demon realm, eyes decide everything from power to status and rank. The lowest level of demons have no eyes, they are like spiritual beasts and attack the first thing they hear. Above them are the common demons with black eyes. Above them are demons with golden eyes and they have tremendous amounts of spiritual energy.

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At the top of the hierarchy are the red eyed demons and they rule the demon realm while golden eyed demons are usually nobels or high poisition ministers. Demons believe in the purity of bloodline so red eyed demons usually marry either golden eyed demons or some other red eyed demon. The same is true for the golden eyed demons." Kai explained the hierarchy system of the demon realm.

"But why is Azazel in the body of a man? Didn't he enter the body of a child?" Mia asked after Kai finsihed his explanation.

"After destroying the boy's soul, Azazel's summoned his true looks. The only thing that remains of that boy is those golden eyes since he was born to a common black eyes demon who had a one night fling with a drunk golden eyed demon. But that demon soon died after giving birth to the boy and he was not able to awaken golden eyes which happens sometimes.

But since Azazel inhabited his body, the boy's true powers were awakened. That's why he was the perfect vessel for Azazel since he could use the boy's powers to its maximum." Kai explained as two black wings appeared from Azazel's back.

He gazed at the younger Kai and Rias and flames covered his wings.