Slayers in a Heroic World

Ch.14 Fully Realized

Disclaimer I do not own My Hero Academia nor Demon Slayer

I only own the Plot and Original Characters

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*Narrator Pov*

AFO trembled in place as a cold sweat ran down his body. He felt true fear in his body as he stared at Izuku who stood at the edge of the window with a blank stare. Gripping that sword so tightly that the crimson red of the blade seemed to glow brighter. He could hear the hisses of Izuku's breath as it grew rapid and short. Then in the right corner of Izuku's head, a burn seemed to grow into a sun-like pattern and it burned red like it was on fire. AFO gritted his teeth in anger as he stretched his arm, producing more bony tendrils.

AFO: Like it matters that you look like them! That my brother is inside you! None of that matters I am God in this world now! So kneel before me and die!

AFO launched the tendrils at Izuku who just stood there. Izuku took a deep breath as green lightning crackled off him. Then he was just gone appearing behind AFO who still hadn't reacted to it. The second after the tendrils just disintegrated into millions of pieces as if cut and burned at the same time. AFO's body was filled with slashes all deep and burning like he was hit with napalm. His right arm fell to the ground, his torso almost fell off its legs from a cut separating them, his head barely staying attached to the slash on his neck, and finally, his knees separated forcing him to the ground from a slash on both of them. AFO spit blood from his mouth as he tried to keep his head attached veins of anger bulging from his head.

Izuku: I think kneeling looks better on you than me.

Izuku's voice held no emotion in it as he stared down at the king. AFO growled as he ignored the pain forcing the healing to finish turned his arm into a bony scythe and slashed back to where the voice was. He hit nothing as Izuku reappeared next to him thrusting the tip of his sword into his side.  

Izuku: Sunflower Thrust.

AFO side exploded leaving a hole in his side as he coughed up more blood. He tried to retaliate with another scythe but Izuku just countered with an effortless slash that cleaved through the scythe like butter. Forcing AFO to be the one to leap back.

AFO: 'He did an attack without saying the full name? I was told they needed to or the attack wouldn't be effective enough. Is this not effective? Damnit I need to kill this monster now!'

Izuku stood there looking at his hand as he flexed it feeling his power up out. He was only at 5% when he moved yet he felt incredible like he was at a whole new level. He pushed it to 15% as he looked back to the king with a serious expression. AFO looked back with pure hate as he formed his giant abomination of an arm again. He went to punch at Izuku but the hero was in front of him again slashing upwards destroying the arm into a million pieces and landing even more slashes that cut up the demon king. 

AFO tried to form another attack as he healed from the assault. He formed a spikey ball swinging it at Izuku who just leaped back while swinging in wide arcs creating several fiery slashes that launched at AFO. The Demon King raised his guard tanking the hit before swiping the dust cloud away from him with a growl.

AFO: Fucking brat!

Izuku's 15% would usually just be 15% but combined with the power of the mark and other scenarios activating Izuku has reached the equivalent of 60% of OFA.

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The world watched in awe as Izuku fought the Demon King. It was graceful and elegant compared to when All Might and those mysterious figures were fighting. As if a dancer was performing with a wild animal or the matador with their bull, instead this time the matador was the one chasing the bull.