Harem Overlord

In a place which was situated who-knows-where, Death was casually sipping some coffee while reading a book.

Billions of bookshelves surrounded him, each containing many books. In total, trillions of books surrounded him.

These books were known as death books and they contained information regarding a person's death like the cause of death, the one who killed the person, the place of death, etc

Every single person in this universe had a death book and it would open five minutes before their death.

Or at least, Death had thought that every person in the universe had a book. But some people were out there without a death book.

As he was simply drinking some coffee and reading his book, a red alarm started to resound in the library.

He frowned as he put the book down as the shelves in front of him started to change their positions.

"Code black on the Mortal Cultivation Realm." A mechanic voice resounded in the library as it changed itself to show the books belonging to the people living on the Mortal Cultivation World.

Every book was arranged according to a particular realm and were further arranged according to the regions or continents present on that realm.

Furthermore, the books were then arranged in alphabetical order so reapers could easily go and bring the souls to Death.

He would then use his scythe to collect those souls and would drop them in the darkness. But a code black was something he had not expected.

Reapers started to appear beside Death as all the books belonging to the people living on the Central continent started to open. They continued to open and only a single book was left.

Death went forward and picked up the book as he checked the name written on the book.

"Risea." Death said out loud as the reapers gasped.

The last time a code black had happened, an entire realm had been destroyed by Kai. This incident was named as the annihilation of the fairy realm and was marked in the history books.

The reapers had to do overtime to reap billions of souls and death had to travel to the darkness numerous times to deliver those souls.

"I guess you will have to do overtime again." Death said as the reapers sighed as he put the book back.

"Umm, boss? I have a question." One of the reapers asked as Death nodded for him to continue.

"Were you reading an ero-manga?" The reaper asked as he pointed at the image of the naked girls printed in the book.

"No, I was just reading a book." Death replied as the reaper gulped.

"But sir, this is clearly ero-manga." The reaper protested.

"And I say it's a book. How many times will I have to repeat myself? This is a book. Case closed." Death said as the reaper closed the book.

The other reapers sighed at their boss's behavior. Death was the most shameless man in the entire universe.

Not even the legendary Kai could compare to Death's shameless. Speaking of Kai, the reapers started to teleport to the mortal cultivation would to see what was happening.

***

The purple mist gathered behind Kai's back as two dark purple wings tore through Kai's clothes. The entire throne room was blasted apart as his wings completely unfolded.

They were enormous and had a purple mist wrapped around the edges. A feather dropped down from his wings and the ground around it started to crack.

Outside, screams started to rise as storms started to brew in the ocean. Even though it felt as though the royal capital was in the middle of the continent, it was actually closer to the edge of the continent so that the members of the royal family could enjoy the view.

But currently, the view was extremely terrifying. Dark clouds covered every inch of the sky as thunder struck repeatedly.

A tornado appeared in the middle of the ocean and soon turned into a cyclone followed by five more cyclones.

The land trembled as a few cracks appeared on the surface and screams rang out in the streets. But Kai didn't care about any of these.

It was as though he could hear nothing. He slowly rose in the sky as his wings started shimmering.

"Remember when he said that seeing Risea's condition 'my demonic side was released'. I didn't think that he literally meant that." Mia said as nature continued to roar.

"Do you think we can stop him?" Mariel asked.

"There is nothing we can do to stop him. But it doesn't hurt to try." Mia replied but before either one of them would do anything, nature attacked Kai.

A bolt of lightning directly fell on Kai but it was absorbed by Kai's wings. He then stared at the cyclones as they vanished before his gaze.

"What is he? Is he the demon king from the outcasts myths?" Tianjin asked in a terrified voice as Risea stared at Kai in amazement.

The rest of the Fang family also gathered in the throne room as they stared at the demon king. Mia and Mariel moved forward and stood beside Risea.

At the same time, Kai roared as Mia and Mariel suddenly clutched their right breast. Even Risea clutched her right breast as the three of them screamed in agony.

Memories entered their minds without their permission. Memories belonging to Kai started to play in front of their eyes.

"There are only four types of demons?" A younger version of Kai asked the demon empress Rias.

"No, there is a fifth category of demons. They are known as true demons. They have unique colored demon eyes. Lilith, the first demon, had all three common demon eye colors. Her first descendant, Lucifer, had complete grey eyes, and a few millenials ago, there was a demon with complete green eyes.

The reason there are known as true demons is because when their emotions are conflicted, they go full rampage on the nearest thing they see. And it's almost impossible to defeat them in rampage mode." Rias said as the scene changed.

This time, it was the scene where Kai and Risea were battling Azazel. They only got a glimpse of the battle for about five seconds but it was enough time for them to examine the sword in Rias's hands.

It was the same black sword that Kai had used

on some previous occasions. Mia and Mariel remembered the name of the sword.

'Sinbringer' was the name of the sword and it was a special sword that could only be used by the active ruler of the demon clan. (Please suggest any other cool name you might have in your mind.)

The sword was special since it could wield the power of the seven deadly sins, the strongest demons to ever exist. It was said that all of them could defeat Lilith singlehandedly.

Since it could harness a share of their power, the sword was overpowered. However, if anyone other than the active ruler of the demon clan touched the sword, they would be absorbed by the sword and would cease to exist.

Mia and Mariel didn't understand how Kai could wield that sword without being absorbed by it. But before they could think about it, another memory played in front of them.

It was Kai with purple demon eyes and his dark purple wings. The fairy realm was in front of him as he stared at it from the space. He held an unconscious Risea in his left arm as he glared at the fairy realm.

Sinbringer appeared in his right hand as the power of the sins shone brightly on the sword. He raised the sword above his head and swung it at the realm.

The sword extended by many folds and reached the end of the realm. As Kai swung it, the sword cut through the realm as though it was paper.

Tremendous amounts of spiritual energy was released from the dividing of the realm. Within a few minutes, the two halves started to vanish as the entire realm vanished into nothingness.

And with that, Mia and Mariel returned to the real world to see Risea releasing her hold on her chest.

Even though she didn't see Kai's memories, she still felt a little pain in her right chest. As for what caused this pain?

It was Kai's harem mark burning because of Kai's transformation. It was because of the mark that Mia and Mariel were able to view Kai's memories.

But now, as they glanced at Kai, they didn't know whether they could stop him or not. The ground rumbled once again as the Yellow Dragon made its appearance. 

The royal family and the citizens of the royal capital cheered as they believed the Yellow Dragon would save them but Mia and Mariel gravely stared at it.

Kai just lifelessly stared at the Yellow Dragon and Sinbringer appeared in his hand. The purple mist covered the sword as in one smooth motion, Kai shattered the heart of the Yellow Dragon.

The Yellow Dragon's lifeless body fell through the sky as the last drop of hope left the people of the Central Continent.