It was a pretty normal day in the plains of earth, the sky was clear, the air was nice and fresh, and a boy named Y/N was training with Son Goku in the plains of the wilderness.

The two of you were rapidly exchanging blows in base form in midair as the two of you slowly went higher in the air

Y/N: C'mon Goku! Don't hold back! I need to learn my flaws if I want to improve!

Goku: Hehe! If you insist!

You then noticed that Goku's attacks were getting faster, sharper, and heavier all at the same time, you struggled to block most of the attacks as Goku's punches and kicks began to connect, he ended his little combo with a sledgehammer that sent you bolting to the ground.

You began to spin at high speeds before planting your feet to the ground allowing you to have a safe landing.

Y/N: Whew! That's more like it!

Suddenly Goku rushed you from above with a flurry of orange Ki blasts, you didn't have enough time to dodge forcing you block and whack them away.

Goku: C'mon Y/N! You can do a LOT better than that!

Y/N: Oh you're asking for it pal!

You leaped and flew towards Goku at full speeds while reeling your fist back ready to strike, Goku was about to block but before he could, your fist smashed into his face before he could react sending him into a nearby boulder

You then began to launch a full on assault of Ki blasts towards him, soon the whole boulder was completely destroyed and all that remained was a large smokescreen.

Y/N: Yeah...I DO have more fight in me!

Goku: Don't let your guard down!

Suddenly Goku flew right out of the smokescreen and right towards you catching you off guard, forcing you to block once again as Goku began to rapidly punch you with your arms crossed in defence

Goku: This is that "Flaw" you were talking about Y/N! You can't even let you're guard down!

Y/N: Wha-

Goku: DODGE!

Suddenly you received a Heavy punch to the face sending you back a little, you stared Goku down while wiping your cheek with the back of your hand.

Y/N: Let's do this!

Suddenly you went Super Saiyan and flew towards Goku who went Super Saiyan as well. The two of you reeled your arms back ready to clash fists before a large ball of blue Ki zoomed past the two of you.

???: I'm Joining in!

The two of you looked over to the side to see someone who you'd recognize from the other side of the planet

Y/N: Oh! Vegeta!

Vegeta: Kakarot! You honestly think you could fight with Y/N and hog all of the fun to yourself?

Goku: I should of known! That's Vegeta for you!

Vegeta: Enough talk!

Suddenly Vegeta went super saiyan and rushed Goku with a barrage of swift punches. Goku was having a hard time defending himself.

Y/N: Don't Forget about me!

Suddenly you appeared beside Vegeta and Goku Before Sledgehammering the two of them two the ground. The two bolted back to the earth before crashing into the ground.

Y/N: I'm not done yet!

Suddenly you rushed down to them to see them powering up making the whole area shake, Catching you by surprise.

Goku: Let's Skip the warm up!

Suddenly the two of them powered up to Super Saiyan Blue making the ground shake even more and blowing away all of the trees and boulders in the area.

Goku: KAIOKEN TIMES TWENTY!!!

Vegeta: HAAA!!!

Y/N: Geez! No kidding! Alright then! HAAA!!!

You powered up to Super saiyan blue evolution before applying Kaioken Times twenty to it, making your aura much larger then Goku's and Vegeta's

Vegeta: TAKE THIS!! FINAL FLASH!!

Goku: HAAA! KA...ME...HA...ME...HAAA!

Y/N: EAT THIS!!! STARLIGHT BOMBER!!!

All of your attacks rushed towards each other, Eventually colliding with each other making a massive explosion that caused the three of you to make a tear in the dimension, you all floated upside down completely dumbfounded.

Y/N: What the?!

Your time in this strange place didn't last long as the whole place began to crack eventually shattering returning you to reality, but something was off, you were now standing on pavement tiles, and Goku and Vegeta had disappeared.

Y/N: Pavement? But we didn't fight near the city...Where's Goku and Vegeta? Shouldn't they be here too?

You looked around to see a bunch of other confused teenagers looking around

Midoriya: Whoa! What happened?

Issei: This is weird!

Ruby: This isn't remnant!

You looked around before gaining a dumbfounded expression on your face

Y/N: What the heck is going on?!