Alex, a 40-year-old serial killer, belonged to the Deadly Bloodlust organization. Respected by the higher ranks, he was the top serial killer globally and the highest-paid in his deadly profession, known far and wide.

In Alex's world, an alien invasion occurred as extraterrestrial beings sought to take over the planet. These aliens were planet plunderers, aiming to invade, kill humans, and perform a ritual to increase their strength with all the living creatures in the world.Launching surprise attacks, they caused chaos across cities, leaving the human race powerless against their superior abilities.

Despite the overwhelming odds, humans refused to surrender. They opted to counter the invasion by consolidating their forces, turning the fight into a formidable defense.The human leaders initiated technological research to find ways to defend the aliens. They agreed on centralizing their efforts to protect the world, putting aside all of their differences that existed before.

Attempting negotiations with the aliens proved futile, as the extraterrestrial beings vehemently opposed discussions. Their goal was not cohabitation but for their own gain. Negotiations were dismissed as the aliens sought to exploit the planet for profit.

As researchers delved into the alien race, they discovered a crucial detail—the aliens were all connected to a leader known as Aliyenza. To deal with the invaders, eliminating Aliyenza became the primary objective, realizing that his demise would lead to the fall of all aliens.

The challenge emerged: who could muster the courage to hunt down Aliyenza, the alien leader? That was something that was almost impossible for them to do because of the defenses of the aliens when it came to the leader.

Despite being a serial killer, Alex, stepped forward. According to him, fighting the aliens directly was almost impossible. But still, as a serial killer, as long as he got a chance, he would be able to eliminate the alien leader.His towering figure and determined gaze reflected his commitment to saving his world from the invaders, vowing not to let aliens succeed in his presence unless they overcame his lifeless body.

Killing Aliyenza was going to cut the link to other aliens. They would stop receiving the energy that they were receiving, the life-force. As for whether they were going to die, since nobody had ever tried, they were not sure. They could only gamble.Alex, as a serial killer, couldn't afford to waste any more time; his mission to save humankind weighed heavily on his shoulders.

Preparations were crucial because facing the aliens' leader required a strategic approach.An idea struck him – since the aliens were all connected to one boss alien, he believed there was a vulnerability to exploit. Alex approached the technology researchers in his organization, uncovering the aliens' weakness. The information was highlighted for Alex.

Aliyenza, the alien leader, was connected to a luminar core in his physiology, situated under the chest cavity. This core emitted radiant glows, providing power to other aliens and strengthening Aliyenza. Alex being a skillful in his profession, knew that he needed a void steel dagger.A very extraordinary dagger known for it's ability to nullify energy fields.

That was incredible achievement in Alex's preparation.With this vital information, Alex was ready to venture into the aliens' territory, strategically located in one of the cities, a territory granted by the aliens themselves.

Alex calculated every step on time to ensure there was no mistake.The Deadly Bloodlust organization operated under a veil of secrecy. Alex's attack had to remain covert, catching the aliens off guard in a surprise assault. This strategic plan was essential for Alex to confront the aliens and battle them to the last minute, ultimately saving his human race from invasion.

The time had come for Alex to face the aliens. His reputation for executing excellent surprise attacks preceded him. Clad in gloves, masked, and with his head protected by a helmet, Alex was set to leave. Before departing, he gathered everyone and offered a prayer, expressing his determination to return with victory. His intention was clear – failure was not an option.

With his arsenal well-placed, he departed for the alien territory located to the west of their organization, about 10 kilometers away. Fully determined Alex moved with a fast pace across the huge forest that offered a shortcut to reach the aliens territory.

Surprisingly, as Alex reached the aliens' territory, the aliens were eagerly expecting him. Ironically, someone from the Deadly Bloodlust organization had leaked information to the aliens, making them aware of Alex's mission to kill their leader and dismantle the entire alien race.

With the aliens in position and prepared for battle, they welcomed Alex. There was no room for excuses; he had to face the harsh reality. Engaging in a bitter fight, Alex's prowess allowed him to counter the aliens and launch a tactical battle that left the aliens astonished.

In a one-on-one confrontation with Aliyenza, the battle was far from simple, with neither opponent underestimating the other. Alex, realizing he was alone, fought hard to maintain his strength. Despite his efforts, the exhausting battle took its toll.Attempting one final move, Alex aimed to reach the chest cavity of Aliyenza. Using his void steel, he cut through the luminar core, immediately stopping its radiant glows.

However, this bold move had consequences. Alex was caught off guard and stabbed three times in the chest by Aliyenza. Collapsing to the ground, red blood flowed at an abnormal rate, covering the surroundings.Struggling on the ground with difficulty breathing, Alex's unconscious state left him without assistance.

Despite his best efforts, the unexpected turn of events aligned with his prayers.Raising his head, Alex locked eyes with Aliyenza. They stared at each other, and Alex witnessed Aliyenza yelling in disbelief and panting. Green blood flowed from Aliyenza chest cavity at a high rate. In the blink of an eye, Aliyenza closed his eyes and succumbed to death, while other aliens on the sides froze and disintegrated into dust.

"Although I'm going to die in the next minute, my mission is complete. I've tried to save the human race, even if it has cost my life. I worry less." Alex, after confirming Aliyenza's death, knew his mission had been accomplished. He had never disappointed, maintaining his profile. The human race had been saved from the biggest invasion ever. Alex opened his eyes once more and closed them, bidding his world a warm goodbye.

Confused, Alex opened his eyes, unsure of the time that had passed. To his surprise, he found himself in a state of bewilderment. Questions flooded his mind as he grappled with the inexplicable reality. What force allowed me to persist in this form?

The disorientation deepened as Alex tried to make sense of his surroundings. The unfamiliarity of his existence added to his bewilderment. He questioned the very nature of his being and the peculiar circumstances that defied his expectations. "What really happened to me?"

As the shock settled in, Alex wrestled with the implications of his inexplicable survival. The thin line between life and death blurred, leaving him in a state of uncertainty. The surreal experience prompted introspection and an urgent need to comprehend the mysterious turn of events. "Why am I here? Shouldn't I be dead?

However, fate seemed to have other plans for him. He had been transmigrated in another world in a body of a 20 year old young man."Wait, how am I alive? Where is this place? Is this the afterlife?" Alex remembered clearly the pain that he had undergone before he died. It was just that, he didn't understand how he was alive.

He looked around, only to realize that he was inside a small room that was old and only possessed a few crucial items such as the bed that he was lying on, a chair and a table not far away from where he was.He managed to get out of bed with a lot of difficulty and headed towards the only window of the room.

Peeping out through the window, he saw a group of people moving around. From time to time, he could see that some other people were flying in the air without any external assistance. This was something that amazed him."This must be a fantasy world, where the strong prey on the weak, the monsters being enemies of humans." Alex muttered to himself as he looked out the window with awe and amazement in his eyes.

In his world, although they were strong, they mainly depended on technology to combat the invading aliens. But here, this was definitely a world that focused on arcane powers. All of a sudden, Alex was attacked by an immense headache. In the next moment, a flood of memories poured into his mind.

After about five minutes, everything receded. He finally realized who the body that he had taken over was. The young man whose body he had taken was called Alex, just like himself. He was an orphan who had been having a difficult time surviving. The house that he was in was the only thing that his parents had left for him.

Alex wanted to understand more about himself when suddenly, a holographic screen popped up in front of him with a notification sound.

Ding!

[Congratulations to the host for getting bound to the Universal Assassination System.]

[The host will be granted missions by the Universal Assassination System. Immediately after successful completion of the mission, the host will receive rewards from the System.]

[The host will be summoned through the System to take missions universally, across different worlds. After completing the missions, the system will always transport the host back to the current world.]

Alex was once again stunned. He looked at the prompts in front of him as the information sank into his mind. Just as he was trying to comprehend the information, another prompt appeared.

[The host's stats are as follows:

Name : Alex

Race : Human being

Age : 20 years old

Profession: Assassin

Rank : E

Power Level: 4

Skill: Stealth, parkour, Shadow blink.]

[ The host will receive the first mission in at most 1 hour....]