The World seems Realistic but Why do I have a Leveling System?

Seeing the masked girl rushing straight at him, the priest sneered in response before gesturing one of his men, a man with a solid buff body and as tall as a tree paired up with his ruthless expression, slowly stepped forward to intercept Sheila. When Sheila arrived in front of the buff man, she immediately punched toward him but the man easily took hold of her fist before counterattacking by throwing her away the moment her fist was in the grasp of his hand, it was as easy as handling a child... or so, both the priest and the buff man thought.  

When the buff man stood in front of the priest to intercept her, Sheila crouched down to her knees before launching a punch straight toward his jaw, sending an uppercut to the man, of course only enough to knock the man out, if she had used her full strength, something might have exploded to pieces. The buff man couldn't even avoid it in time as her speed was just too fast for his eyes to follow, without the ability to prevent Sheila, the man was flying through the sky a few meters above before falling onto the ground with foam out of his mouth. He was knocked out with a single move from the masked girl who they thought was weak after they were restrained by the power of the miracle.

Before the priest could get back to his sense, Sheila was already right in front of him with her fist speeding toward his face and, the priest thought he would be taken out at that moment if not for the fact that the barrier surrounding him managed to stop her. But the moment it came in contact with her fist, thought the punch didn't hit him directly, he was still sent flying a few meters away from the impact of her punch. Sheila had used a lot more power in her punch because she didn't know how strong the barrier is. Everyone on the scene was surprised to see how powerful a punch could be, especially one coming from a thin girl. If they were not on the scene and someone else told them that, they would have thought that person was mad/insane. 

"Such strength..."

Angelica muttered in amazement, after getting restrained, she feels like her strength was reduced to that of a normal person. Though she does have experience in close-combat, her strength was concentrated fully on the mystical power within her, she could be said to be that of magician since she depends on mana most of the time due to the artifact. That was why when her mana was sealed, she feels like someone who was crippled off her strength. All she could do was to fight them with her bare hands, thankfully her injuries were already fully healed, it would have been much worse otherwise. 

"What a surprise, are you even human?"

The priest couldn't help but seriously said that as he could see a small crack appeared on the barrier around where she had punched, though only Shiela and him, the cross holder could see it. This was the first time he had seen the barrier having a crack on it from a person, he even wonders if the masked girl in front of him was even a human, to begin with. When he looked around and saw his subordinates stood frozen on the spot instead of doing something, the priest's expression turned cold.

"What are you standing there for? Are you a fxcking tree?! Pull out the cross that has been given to you and attack her, now!"

The shouted from the priest brought them out of their stunned state before they, one by one, pulled out a white small cross with a small line of black around it from their pocket and immediately started chanting simultaneously at once. The spoken word from the chant was entirely different than the language spoken by them as none even understood what they were saying but, the proof that the chanting works was that the people who were chanting were now enveloped by a warm light surrounding them midway during their chant. 

Seeing this happening in front of her, no way in hell would Shiela let them do as their pleased as she immediately sprints toward the priest instead of the others as a wise person once said, aim for the leader and everything will fall apart. The priest didn't flinch when Sheila arrived in front of him as he pulled out something from his jacket, though he was called as a priest, he was actually wearing a normal modern outfit. When Angelica saw what the priest pulled out, she couldn't help and shouted.

"Be careful!"

Bang! Bang! Bang!

The sounds of three continuously gunshot resound amidst the chanting in the mountain as the priest was certain that there's no way the masked girl could avoid the bullet at such a close range. But the priest suddenly vomited a mouthful of blood onto the ground as he could feel the pain of something small pierced through his body and when he looked down on his chest, he could see blood spreading on his jacket.

"W-What...How?"

When he turned around, he could see the handgun he was familiar with was now in the hands of the girl wearing a mask pointing straight at him which makes him realized that he was actually holding nothing in his hands. Though he found this situation unbelievable, the fact that he could feel himself slowly losing conscious was nothing but real. He didn't know how it happened but when he pulled out the gun, it seemed that Sheila moves at her highest speed without the priest being able to follow her movement and stole the gun from him before shooting at him three times on the chest. But not before Sheila shattered the barrier with a single punch from her full strength, after all, it was merely a work from a magic item, it was not as solid as barrier magic that she had seen in the system's shop.

Before the priest closed his eyes for the last time, a thought appeared in his mind, This is unfair! She can't possibly be human with such inhuman speed! There's no way I could do anything to someone like that! Oh, Just how ignorant I was... 

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