New York. 

Hell's Kitchen. 

In an inexplicable corner store that seems to be ignored and completely forgotten once glanced at, a white light radiated for a moment, than dimmed to reveal a young man with curly hair and light brown skin who seemed to be off African and Mexican descent. 

The young man named Valentine was completely baffled as to how he appeared in this weird looking store. He looked around for a while, noticing that the front of the store was see-through yet no one looked in his direction. They all acted as if the store didn't exist at all. After a few moments, he tried to recollect his prior memories before coming to this place. He remembered being in a taxi and headed home but everything after that seems to be a blur. 

" what the hell is going on here?"  " where am I?"  

[ Ding… Devil Fruit System Activated ]

[ Welcome host…..What are your commands? ]

" Devil Fruit system? Wait…don't tell me I got isekai'd or something. "

[ Yes… host. You are now in the world of Marvel.] 

" Marvel? Well…. this sucks.  Wait a minute, what's your function, system?"

A translucent panel appears in front of valentine as he was still in thought. 

" ohh… here we go. "

[ Devil Fruit System: 

{Contains all known devil fruits, canon or non-canon from the world of one piece.}  

{Also contains original devil fruits created by the system.} 

{These devil fruits have been altered and are different from the original ones in the world of one piece. Each fruit will grant the user the physique of humans in the one piece world and allow them to awaken haki. The fruits also have no weaknesses to the sea or seastone which does not exist in this world. However, magic or certain abilities might pose a threat to some devil fruits but haki can compensate as long as it's strong enough. }

{ The host cannot eat said devil fruits and can only sell to characters in the marvel world to gain points for altering their fates.} 

{ System Store : Host can purchase any item or ability from infinite multiverses as long as host has enough points. }

{ Devil Fruit Store: an isolated dimension with an anti-memetic effect that cannot be interfered with or noticed by any entity except for the host. Only those destined for a devil fruit can see the store.} 

{ Beginners Pack *2 } ]

" Anti-memetic huh…. Sounds like something from the scp universe. Anyways let's see what we got in these gift packs."

[ Beginners pack opened…..Reward: Fish Fish fruit Model: Azure Dragon. ] 

" Holy shit…. Kaido's devil fruit? That's one hell of a start. Awesome. " 

[ Beginners pack opened…..Reward: Peak Monkey D Garp Template: 100% Proficiency. ] 

"Damn, even without Kaido's fruit, this template alone is enough to go toe to toe with beings like Hulk and Thor. "

As Valentine was thinking, a warm current permeated throughout his whole body while simultaneously gaining knowledge of garp's haki and boxing style. 

" Holy shit, I feel like garp's galaxy impact can probably obliterate all of Hell's Kitchen. Alright, I need to figure out where to go from here." 

" System…. What Marvel universe is this? "

[ Host, this is an alternate Mcu with all the missing characters including The X-men and Fantastic Four. ] 

" Well damn, things just got more complicated. Anyway that just means more customers whose fates I can alter. "

While Valentine was engrossed in the system, on the other side of Manhattan, a huge light column went straight into the sky creating a massive dark blue portal that showed the other side of the universe. 

Valentine noticed the portal and showed a smile knowing the ensuing chaos would be a perfect chance to test his newly gained strength. 

" Since this is an alternate Mcu, I wonder how the New York war will differ from the original. " 

Meanwhile, near the stark tower. 

The avengers and a few X-men are fighting off the Chitauri while Mr. Fantastic and Invisible girl are helping civilians evacuate the area. 

"Tony, we need to find a way to close that portal." Captain America says over the comms as he throws his shield knocking down a few chitauri. 

" I know, but this portal device seems to have an impenetrable barrier around it. Hey Reed, I could use your help here. "

Mr. fantastic who was busy evacuating people heard tony over his comms. 

" Alright, I'm on my way, hold on. 

"

In the battlefield, Loki who was riding a chitauri chariot chasing down black widow noticed Hawkeye whom he previously controlled aiming an arrow and shooting at him. With a wicked smile, Loki nonchalantly grabbed the arrow with a hint of mockery but immediately regretted it as the arrow exploded and hurled him towards the stark tower.  He was embarrassed and angry but was met with hulk slamming him through the window and onto the wall. Loki stood up immediately looking at the green giant in front of him, he cursed. 

" Enough!!!…. You are all beneath me. I am a God, you dull creature and I will not be bullied by ahh…." 

Before he could finish his sentence, hulk grabbed him by the ankles and slammed him back and forth on the ground then walked away saying puny god while loki was left embedded on the floor wheezing for air and doubting his life.  

On the other side of the battlefield, the portal seemed to be getting larger with more chitauri and mechanical leviathans coming from the other side. The heroes seemed to be overwhelmed when suddenly the sky began to be covered in dark clouds, even obscuring the portal. 

" what the hell is going on? Are there any more aliens coming? Tony looked at the sky, a little helpless. Everyone was exhausted from fighting the chitauri and now things seemed to be getting worse. 

Everyone looked at the sky when suddenly, a blue gigantic arm with three massive claws popped out of the clouds, followed by a massive head, the size of a building. 

" Oh my god, tony, Am I seeing things? What the hell is that creature? The captain said as he looked at the giant snake like creature that was hundreds of metres long. 

" It looks like an eastern dragon. Tony said as he took in the full view of the massive creature. 

Before he could think of a way to fight this creature, the dragon turned its head and looked at the portal where several leviathan like creatures were coming out of. It opened its giant mouth and looked like it was condensing a massive ball of fire. After a few seconds, it spit out a huge column of fire aimed straight at the leviathans, melting any chitauri along the way.  The fire column pierced through two leviathans and went straight into the portal damaging the mothership but not completely destroying it. 

The huge dragon let out a deafening roar and looked like it was shrinking until it took on a vague humanoid shape and fell from the sky, smashing into the ground near the heroes. 

Captain America who was fighting chitauri alongside Thor, Human Torch and Cyclops looked at this scene puzzled. 

" That huge dragon turned out to be just a kid?"  

Valentine turned to look at the heroes and smiled, " Might wanna brace yourselves. " 

In the next second, he released his Conqueror's Haki towards the swarming chitauri. The whole sky seemed to darken with black lightning flashing all around. The Chitauri on the chariots and the leviathans all fell from the sky unconscious, not able to bear the immense pressure that seemed to be locked onto them. 

" Hahahaha…. Looks like there's still one left. 

" Soru!!…

In the next second, Valentine appeared in front of the remaining leviathan. 

" Galaxy!!!…..  Divide!!! "

Without the fist even making contact, the leviathan's insides were completely destroyed. 

Valentine landed on the ground, looking at the leviathan falling in the distance. He turned to look at the heroes, but before that, his observation haki picked up an object headed this way, fast.  " huh… that must be the nuclear bomb. Can't wait to see iron man in action. "

As he said that, Captain America who was standing near by heard black widow over the comms saying she could close the portal. 

" Do it.

No…wait.

Stark! These things are still coming.

I got a nuke coming in, it's gonna blow in less than a minute. 

Tony followed the original path and sent the nuke straight through the portal, but this time, valentine turned into a dragon hovering below the portal. Tony fell on the dragon's back and was brought down safely.