The world of Altanya consists of three continents: the land of humans, Oris, and the ancestral island.

The Ancestral Island is a giant island between the two continents (the land of humans and the Oris) and plays the connecting line between them.

The island is covered with mountains, rivers, and forests. Although they call it an island, it can be called a third continent.

Ancestral Island, so-called by the Oris and the rest of their races, believes that their ancestors' souls inhabit the giant tree of life. This holy tree is also the key to revealing how to reach the founding kings' hidden tomb.

On the other hand, humans call it Black Wall Island because of the black mountain on its borders.

Due to its size, the island contains many natural resources of herbs, minerals, and hidden ruins. Therefore it has always been coveted by humans.

And when beliefs conflict with interests, there is no escape from conflict, conflict produces wars, and wars produce grudges. Thus the war cycle continues for the sake of controlling the island. The Oris creed is not shaken, and human ambitions do not end.

But during all this chaos, there is a secret that has not been revealed. In every war between humans and the Oris, the Oris always had the upper hand. However, they always seek a truce first and make great concessions even though they are winning. Surely humans do not miss such an opportunity. So they agree to the ceasefire. However, as usual, they make a treacherous attack after a while.

For the first time in tens of years, things turned around, and humans managed to win and occupy the entire island, but they did not show the mercy with which Oris had shown them.

They let their beast, the master of poison known as the Plague, spread in the land destruction and corruption, killing everything he encountered on his way, even children and old people. But, of course, he is killing them just for fun.

In the end, The plan backfired, and the beast that humans created turned against his masters to make them taste the poison that they praised his power.

After killing everyone on the island, the Plague, a title worthy of those who only left corpses and destruction behind them, appointed himself king of the Ancestral Island.

Days passed. Neither humans forgot the betrayal of the Plague after he snatched the island from their hands, nor did the Oris forget their victims. Amidst this many enemies, the new king decided to create his own squad of assassins. The best means of defense is attack.

He gathered around him the strongest and smartest orphans from the humans and Oris and took charge of their development himself. Through his previous experiences with humans, he was able to enhance their abilities, ​to form a group of six young men who became his eyes with which he spied and his arms that oppressed his opponents and everyone who intended to stand against him.

Although the skills of these young men were not the best in the world of Altanya, they made a name for themselves. Their work focused on infiltrating the enemy’s land and causing sedition and treacherous killing, whether by poisoning or slaughtering others while they were sleeping. In short, they were the most skilled in dirty work.

Among the six, there was a hybrid.

Half-human Half-Oris, born with an enviable body, endured all surgeries to enhance his body and carried out every task asked of him until he and his master the Plague were considered two sides of the same coin, his name was Sixth.

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At the western port of the island, a brown young man in his twenties with pointed ears, dressed in black, stood staring at the passengers disembarking from the ship that had just arrived.

As soon as he saw the person he was looking for, he shouted:

"Sixth, come here."

Answering his call, a young man with slightly red skin and black hair waved his hand in response. As soon as he set foot on the port's ground, he disappeared from his place to appear in front of him with a smile on his face.

“Second Brother, you came to welcome me, my pleasure.”

The sharp-eared young man gave him a stern look.

"Sixth, stop being silly and walk in front of me. I'm here to make sure you reach the headquarters in time, and also don't mention my brother's word on your tongue again."

The red-skinned young man stretched out his lower lip like a child expressing his sadness as he was moving with slow steps leading the way, muttering.

"And I am the one who thought you missed me and came to welcome me. You are mean. Why do you refuse to be my brother? Aren't you bothered being called by numbers?"

Sixth did not finish his words until he sensed a killing intent behind him, and before he even turned around, the sword had pierced his back, then he heard a sarcastic laugh.

"All these years, I've been wondering whether you're stupid or not, calling me brother and bringing me gifts and asking me for advice. No matter how much I insult you, you are just like a glue that always sticks on me."

Red blood fell from the young man's mouth as he said:

“It was the only way…”

Before the killer could ask Sixth what he meant, his eyes widened as he saw the body he had stabbed turn into a black shadow before disappearing.

'It was an illusion? This is impossible. When did I fall under his influence?'

He felt something sharp go through his back, and then he heard a whisper.

"Gifts are the way to keep you under my illusion. They all had hidden magic circles inside them. I mean, look, the moment you were out my sight, you stabbed me with my gift, man. At least you should have got another sword."

Sixth completed his words and thrust his knife into Second's back. As soon as Second felt the dagger cut his flesh, He immediately activated the Body Hardening Technique to stop the dagger from reaching his heart and jumped away while cursing.

"You bastard, you've been casting your magic on me all this time. I knew it. All your bullshit about your legendary missions and how you killed the leaders of the Oris were all nonsense and lies. They are all alive. You have betrayed our master and us."

"Betrayal, huh? In our field, this word doesn't make sense. We are a group of assassins who existed to protect their mad boss. Betrayal is a relative matter. For example, when I told First brother that Third brother killed his girlfriend, he thanked me for telling him, while Third described me as a traitor."

When Sixth finished speaking, the young man with sharp ears was smiling maliciously to say.

"So you planned to kill Third too. My intuition was not wrong, I never trusted you, but do you know what your fatal flaw is? You like to talk a lot. Thank you for giving me time to recover and gather my energy."

Second released an insane aura, enough to terrify any opponent. However, Sixth's expression didn't change, he didn't even bat an eyelid.

"Did you recover that quickly? I wanted to talk more with you because I won't see you anymore. Send my regards to the third brother."

Second's body had completely turned bronze, and he said with a mocking expression on his face.

“Do you think you have a chance against me? Or do you think that your poisoned dagger will affect me?...”

Before he could finish speaking, his vision became blurry as he felt his knees become weak, his eyes widened, not believing what was happening to his body.

'Have I been poisoned? Impossible, among the six of us I am the most resistant to poisons'

“impurities….” The sixth’s voice came explaining

“It’s the impurities that have accumulated in your body over the years. As you can see, the magic circles are not the only thing in the sword. The sword handle also contained poison preventing your body from getting rid of the impurities of the energy pills you constantly ingested.”

Sixth started waving the dagger he had stabbed Second with in front of his eyes as he continued to explain.

“This dagger does not contain poison, but an antidote to the poison in your body that will release all impurities at once, oh no, the irony. The strongest antitoxin body will die because of an antidote.”

Second's eyes were staring with hatred at his killer, wondering.

'Since when was he planning to kill me? And since when was he poisoning me?'

Sixth knew what Second was thinking, so he answered him.

"Don't look at me like that. The poison in the sword's handle wouldn't have killed you, it won't even affect your training. I was just taking my precautions. I know well that the master would not have sent you here to pick me up. You tried to kill me, so you need to bore the result."

The light was going out from Second's eyes, and his breaths were starting to fade; he knew that this was his last breath, but he kept smiling.

"Never mind, I'll wait for you in hell, you little bastard."

“Okay, wait for me. I know you don’t like the company of the third brother, so I will send the rest soon.”

At this moment, black shadows arrived at the place and surrounded Sixth.