Y/n, a average guy who had a normal job and also trains Martial Arts at weekend and every free time... One night when he goes to sleep, he dies into a suffocation due to the apartment which is burning which he didn't aware and died in a process...
Grand Priest: Good job my student but how about I'll show my true form this time...
Y/n: Nani! True form... That's...
Grand Priest: Angels are always holding back in a fight, but when a times like this, I'll let them transform into their full power... But how amazing you possess with a training and calmness of an angel and the destructive power even beyond to the strongest mortals and gods so behold my true power...
As he charges up his Ki, his power increases to the point his boy becomes bigger even the height and body mass including the ginormous muscles...
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Y/n: If in that case, I'll show you my final form combine with Mastered Ultra Instinct with this!
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Grand Priest: Come... Show me what you can do my student, you can do far better than that!
As the two clash their fist, the entire realm of void, starts to crack due to their insane strength but Y/n repaired using his reality warping making durable to withstand their shockwave of their attacks... But due to Grand Priest's Experience he able to outmaneuver but countered by Y/n's infinity in order not the attacks landed and followed Y/n's New Technique combined by Saitama mode called Serious Series:Super Serious Consecutive Gravity Gamma Ray Punch withmixed of hyperspace portals surrounding him with omnidirectional portals which he manipulated the size of his fist on little larger enable him to deal massive damage...
Y/n: Serious Series:Super Serious Consecutive Gravity Gamma Ray Punch!
As the attack landed and he did caught the attack and cause him a ton of massive damage but he regenerate and created after image clones... As the Clones going to attack him, he clapped them using his hyperspace portal and enlarged his arms to crush the after image but as soon the Original Grand Priest strike him into the back, Y/n quickly dodged but got flicked by him and use his erasure beam to finish Y/n but he able to tank and survive without any scratches...
Grand Priest: Impossible!
Y/n: Now it's my turn!
As he teleported right beside him without even realizing that he is using a final technique called Serious Series: Serious Big Bang Exploding Heart Gamma Purple Hollow Ray Burst Punch! A combination of a real Big Bang that created the universe but it's inverse of destroying it combine with Exploding Heart Release Fist a destructive martial arts technique combined with Gamma Ray Burst a exploding star and Hollow Purple somewhat a black hole doesn't suck but erases it with conceptual level enabling it to be his final strongest attack to date...
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Y/n: Eat this! Serious Series: Serious Big Bang Exploding Heart Gamma Purple Hollow Ray Burst Punch!
As the attack landed, the Plane of Reality Collapses and he killed him in a powerful explosive combined with erasing abilities makes his creation of void back to his home and luckily the house wasn't destroyed and the Grand Priest Erased with one blow easily with his super one punch... But as the essence of his power fading away, Y/n absorbed its power enabling his base and Cosmic Form even more powerful before while he goes back to his base and go backs to his casual clothes...
Y/n: Since I've defeated the Grand Priest, all I need to do is challenge the Heroes Universe not super but how? I'll deal with it later but now All I need is to rest for now or maybe I'll need a day off...
As he goes to his living room, he goes busy Playing games on his PS5 for now since he was tired fighting for now and try to do other things...
