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...
A one step goes instantly behind goku, the speed, the reflexes are far beyond than he anticipated and Y/n Able to use his technique without even goku noticed it...
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Y/n: Monster Calamity God Slayer Fist!
A one technique able to fatally damage goku to the point the injuries are almost going life threatening due to his sheer technique, power, and even the mastery of Ultra Instinct Omen is far surpassing so much so that he might be better than he his and landing through the ground with his hands snapped but able to recovered it but with sheer pain... The ribs and parts of his backbone is almost shattered and if Y/n did it once more, he might going to kill him...
Goku(Thoughts): I noticed even his adaptability, mimicry and mostly he able to level me out in a short span of 20 minutes... Damn it if this fight continues he might able to beat me if I didn't go all out... Ultra instinct with a proficiency at being a martial artist, he is a forced to be reckoned be so much so that he might beat beerus on a sheer technique and adaptability...
Goku: If in that case... I'll respond to this.
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Goku: You're stronger than I expected but can you handle my own ultra instinct?
But Y/n didn't answered... As he goes using his black flash with red reversal punching Goku but he able to dodged it with difficulty because the two of them are in that state even he feeling pressure while Y/n didn't as he only focusing on the enemy with sheer technique and raw power...
The two clashing with pure speed and power but they able to dodged their strikes perfectly as Y/n did able to block Goku's strongest punch and able to counterattack due to his sheer adaptability and break his defense and use Kamehameha due to able to observe and able to mimic it...
Y/n: Kamehameha!
But it able to counter by using soaring fist but Y/n able to counter it with his own soaring fist and clashing each other as the two close their eyes and only focus to the enemy... Y/n felt a deeper connection as he able to go far beyond it's true limits or they say the true Ultra Instinct... The rush of the fight, the breathing, the explosions coming from the surroundings as nothing as the two fighters clashing around with sheer speed, power and technique as their hearts and mind calm as the battle goes on...
As Goku punches him with insane speed, Y/n is able to use Platinum rings to deflect and ward off multiple barrage of punches and soaring fist coming at Y/n...
Y/n: Platinum Rings!
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And following his one of the strongest techniques combined with hollow purple, black flash, Exploding heart Release Fist called Great Exploding Hollow Purple Fa Jin...
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Y/n: Great Exploding Hollow Purple Fa Jin!
As the attack lands on his chest, his internal organs and his chest erased like Hakai to the point, the heart, lungs, abdomen, liver, intestine and rib cage erased to the point he killed him in one blow... Even how tough Goku's internal organs and body, he can't resisted Hollow purple infused technique which is devastating to internal organs made him dead....
As Goku fell through the ground lifeless as his body chest erased and Y/n depowered back to it's based state and regenerate himself...
Y/n: That was a good battle and warmup but should I use it to original? Maybe I should use it to other evil foes but so far I can understand the basics of Ultra Instinct and this should be enough and combine with cosmic fear it would be or Mastered Ultra Instinct... But you put out a good fight and even learn new techniques and increase my powers far beyond my base form... But now I'll just need to eat multiple foods to restore my energy and fighting spirit...
As he transformed back to Cosmic Form, he revives Goku, and uses reality warping to create multiple food and a table with a infinite amount of water and goes back to his base to enjoy his eating with Goku...
Goku: You're strong and that technique it's deadly and it feels like Hakai infused to technique right?
Y/n: That original technique is to damage or destroy internal organs combine with hollow purple which to erase with Explosive Heart Release Fist to increase the destructive output to make sure the enemy is surely finished or worse dead...
Goku: Wow, that's insane and where did you learn martial arts?
Y/n: It's personal and I can't normally say it and even your ultra instinct is flawlessly mastered on every way?
Goku: No! You're even stronger or mastered? And I felt your connection feels deeper understanding than I am, even Whis told me that I need to find my own way not copy him... Even then I'm hungry and you're hungry to I guess?
Y/n: Yeah Let's eat?
Timeskip: Hour later...
As the two had finished eating a ton of food, Goku suggested if he wanted to get stronger and master the grasp of the Ultra Instinct, he needs to be trained by the Grand Priest himself if he wanted to get stronger and deeper the connection so he summoned the one and only Grand Priest...
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Grand Priest: You're answers had called, so Y/n are you ready to train and deepen the knowledge of your Ultra Instinct?
