Ficool

Chapter 1 - Leveling up

I am a normal boy, but one day when they tried to rob me, I threw him away, but he was not alone, his friend strangled me from behind and stabbed me to death

System: Hi Harry, when you died you went through a process that cannot determine where you will go, so it was decided that you will have another chance, In this new opportunity you will be in High school dxd, the world that you love so much, you will be sent with me, the Solo leveling system.

Without further questions you will be sent now.

I felt my body being destroyed and rebuilt, I felt stronger, without realizing the time I was in a room, for some strange reason I had memories, that were not mine, Yesterday I had my first day of classes at Kuoh school, I'm in Rias Gremory's classroom, I have the same data from my past life.

I opened the statistics interface, I have starting stat points.

And I saw that he had a passive ability:

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+--* Survivor (Pasive)*--+--(LV:1)

Description: Gives you a 1.5 multiplier for a few seconds in your stats and an increase in regeneration 

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Harry: Wow, what a good skill

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+--* Sprint (Active)*--+--(LV:1)

Description: Movement speed will increase

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+--* Enhanced senses (Pasive)*--+--(LV:1)

Description: Evil presences are felt

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I spent all night training and testing my skills, I completed the daily mission

In classes: 

When I entered my class, I noticed something, Rias Gremory was beautiful, now I understand why Issei was a Simp.

Also, throughout my day of classes I realized that Issei was still part of that group of perverts, I have to keep an eye on him to know when the series starts.

When I returned home I passed by the area where Issei and Raynare would meet in the future.

When I got home I started looking for things to go kill demons or whatever I found.

I kept knives in a backpack I had, as well as a baseball bat.

I started walking through abandoned places, until, I felt a presence, in an abandoned place, I went into the abandoned place.

Harry: Hey idiot, Today you're going to be hunted by me.

I only saw a smile that formed on that renegade demon, suddenly I saw how it grew, it doubled my size.

Harry: Fuck.

With my enhanced senses, I managed to narrowly dodge an attack he threw at me with his tail.

I moved quickly towards his stomach and when I was about to touch it with my knife, he sent me flying with his tail.

Harry: Argh, this is harder than I thought.

I launched myself, but before I could reach him, he jumped, dodging his tail. I had an idea, so I activated my Survivor skill.

I started to get better at his attacks, it was still difficult for me but not as much as before, When I connected my knife with his belly, It broke, Damn, Now how do I fix it, my baseball bat.

Harry: Sprint.

I hit the renegade demon right in the face with my bat.

I threw 3 knives at his face, only one hit him, that one hit him in the eye.

System: Sprint cooldown (4s)

Author's Note: I don't know how much cooldown the Sprint ability has.

I dodged another attack, but I felt my agility was weaker.

System: Survivor Cooldown (5s)

The next moment my enhanced senses warned me of an attack but it was too late.

Harry: Argh, Shit.

Hot blood burst from my side as the demon's stinger withdrew with a viscous sound. The pain blurred my vision for an instant, but the survival instinct activated my muscles before my brain processed the wound. I rolled on the dusty ground, a clumsy dodge that made me swallow dirt but kept me away from the next onslaught of that scaly tail.

System: Alert! Physical integrity at 67% - Penetrating wound in the lower thoracic cavity

The taste of copper filled my mouth. The flickering lights of my interface displayed the ability timers: 3 seconds remaining for Survivor, 2 for Sprint. The renegade demon, now with a knife lodged in its left eye, roared, shaking its head like a wounded bull. Its legs tore through the cracked cement, creating craters that sent shards flying to my cheeks.

I gripped the baseball bat with both hands, the rubber grip creaking under my sweaty fingers. The movement was calculated: at the first blink of the Sprint indicator, my calves vibrated with accumulated energy. The acceleration took me to its right flank in a blink, just as its tail struck the spot where I had been half a second earlier.

CRACK!

The impact resonated in the abandoned building. The bat crashed against its rear joint with the force of a pneumatic hammer. A bone snap confirmed the hit. The demon collapsed onto that side, its roar of pain turned into bloody bubbles from the knife that was still lodged.

System: Sprint ability on cooldown (4s) - Survivor available in 1s

The stench of decay intensified as it opened its jaws, revealing rows of serrated teeth that glistened under the moon. My enhanced senses detected the change in air pressure before it spat that dark, murky liquid. I crouched, feeling the acidic heat burning my nape while the corrosive fluid melted a steel beam behind me.

System: Survivor activated - Multiplier 1.5 applied

The world acquired that crystalline clarity that I knew all too well. Every movement of the enemy broke down into frames: the tremor of its muscles before attacking, the wind's direction altered by its broken tail. I dodged to the left, anticipating the blow, and drove what remained of my bat into the ocular wound.

The creature convulsed, its claws demolishing entire walls in its agony. A demonic arm brushed against my shoulder, tearing my shirt and leaving three burning gashes on my skin. Survivor's regeneration worked immediately, closing the superficial wounds while I sought an advantage.

System: Alert! Magical energy detected - Threat level rising

The air thickened with a purple aura that made my teeth creak. The renegade began to inflate like a grotesque balloon, its skin cracking to reveal necrotic muscles pulsating under the moonlight. In its throat, a sphere of corrupt energy was forming, flashing with irregular discharges.

My feet were already moving before the thought was complete. Sprint was still on cooldown, but Survivor gave me that marginal advantage. I jumped over a half-collapsed column, using the momentum to launch myself diagonally towards its deformed head. My hands found the handle of the knife still lodged in its eye.

System: Critical multiplier applied - Weak point identified

I turned the weapon with all my strength, feeling the gelatinous resistance of the eyeball explode under the blade. A stream of viscous liquid drenched my right arm, burning like acid until regeneration countered the damage. The demon collapsed forward, its chaotic attack blasting towards the ceiling and sending two floors of concrete flying.

The deafening roar made me lose my balance. I fell on my back onto debris that stabbed like blades, but I was already rolling to one side when its claws closed in on the air where my head had been. The breathing burned my lungs, every inhalation tasting of blood and dust.

System: Sprint available - Survivor remaining: 3s

A wild smile spread across my cracked lips. This time the sequence was perfect: I activated Sprint at the exact moment that Survivor reached its multiplier peak. The world slowed down almost to a stop. I saw every drop of sweat flying from my forehead, every muscular contraction of the demon as it tried to recover.

My steps resonated like war drums against the ground. I dodged its right claw by inches, stepping on the injured joint to propel myself towards its back. The remaining knife—blade dulled but still lethal—found the base of its skull with the precision of a surgeon.

System: Critical Damage! - Modifier ×3 applied

The monstrous body convulsed in a terminal spasm. Black energy began to seep from its orifices, dissolving flesh and bone into a steaming puddle. I stepped aside just in time, watching as the demonic essence evaporated, leaving only a twisted skull and a purple glow floating over the remains.

System: Daily mission completed - +2 stat points

Additional reward: Ability "Shadow Hunter" unlocked (Passive - LV1)

Description: Increased mobility in low-light environments + Detection of hostile entities within a 10m radiun

I collapsed against a wall that creaked under my weight. 

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