Boros started to power up as Saitama watched, his expression not changing.

Just outside...

You, Ruby, Weiss, Blake, Yang, Bang, Atomic Samurai, Metal Bat, and Puri Puri Prisoner were still fighting Melzargard!

(Y/N): Okay, everyone still good?

Ruby: Yeah!

Ruby held tightly onto Crescent Rose in her mouth, with her Zanpakuto's Bankai form in her left hand and her Magic Railgun in her right hand.

Weiss: You bet!

Blake: No harm done.

Yang: We only need to take down two more of this bastard!

Metal Bat: Are we going to keep talking, or are we going to fight back?!

Weiss and Blake had their rapier and katana in their left hands, their Nichirin Swords in their right hands, and their Zanpakuto's in their mouths!

Yang had her Bankai activated.

(Y/N): Okay! Le-

Suddenly a storm of bullets came down!

(Y/N): WHAT?!

Atomic Samurai: From above?!

Melzargard: It's ALL OVER!

Suddenly they stopped!

(Y/N): TATSUMAKI!

Tatsumaki appeared, using her powers on them.

Tatsumaki: Please, how can you idiots last against someone like this?

Ruby: YOU DO CARE ABOUT US!

Tatsumaki: (blushing) SH-SHUT UP! A CLASS A HERO LIKE YOU HAS NO ROOM TO TALK!

(Y/N): You can't fool us with that.

Tatsumaki still blushed, but she sent the bullets back at the ship!

(Y/N): YES!

Melzargard: AAAAAAARGH!

Melzargard s body shot out like crazed tentacles, and-

(Y/N): COME ON!

You, Yang, and Puri Puri Prisoner caught them!

Puri Puri Prisoner: He looks so handsome when he moves like that.

(Y/N): I HEAR YOU!!

Bang then ripped one of the marbles out and crushed it!

Yang: NICE ONE OLD TIMER!!!

Back with Saitama...

Saitama and Boros started attacking each other rapidly!

https://youtu.be/G0YSYltBAWw

Boros: Heh! I admit! You're really strong!

Saitama: (smirking) Thanks. You're pretty strong too!

Back with you guys...

Melzargard: DAMN YOU!!

He charged to attack, but-

Atomic Samurai: ATOMIC SLICE!

(Y/N), Ruby, Weiss, and Blake: ITTORYU: FLAME BREATHING: NINTH FORM: LION SONG: RENGOKU!!!

As Atomic Samurai slashed at Melzargard, you, Ruby, Weiss, and Blake unleashed flame attacks!

Melzargard tried to fight back, but was stopped by Bang!

Bang: You hide your central organ by moving it around. But you always regenerate your head. Even a monkey had noticed it from now.

You decapitated him, and Bang grabbed the last marble!

He crushed it, and Melzargard disintegrated!

(Y/N): YES!

Ruby: WE DID IT!

Yang: Ha!

(Y/N): Now, we leave it to you, Saitama.

Back in the ship...

Boros punched Saitama in the stomach, sending him flying through several pillars! Luckily, he recuperated in time before Boros could stomp on him!

The alien leader charged a massive energy attack in his chest and fired it!

Saitama was still standing, but getting tired.

Boros: You're pretty good alright! But it ends here! My species survived the struggle for existence in a harsh planet! We possess the greatest natural healing in the universe! And I have the greatest healing, physical performance, and potential energy of us all! I seconds I can close a wound that can kill you!

He regenerated!

Boros: And now it's brand new!

Saitama: Oh God! Shut up! Are we done here?

Boros: NO! NOT YET!!!

He powered up again!

Boros: METEORIC BURST!!!

He hit Saitama so hard that he was sent up into space!

Saitama: That jerk! This is almost a real fight! Well; am I going to do this?

He summoned all his strength and jumped from the moon back to earth!

The force of the landing, hit the ship so hard!

(Y/N): HOLY CRAP!

Tatsumaki: What the hell?!

Yang: Ha! That's our Caped Baldy alright!

Saitama: Looks like I made it.

Boros had a massive smile one his face as he charged at Saitama, and then Saitama punched him, causing him to cough up blood!

Boros: YES!! YOU ARE INDEED A WORTHY OPPONENT SAITAMA!!!

Saitama punched him consecutively o ed and over again, and-

Boros splattered, but reformed!

Boros: I'll just unleash my strongest attack on you! No one has survived this!

He jumped into the air and-

Boros: COLLAPSING STAR: ROARING CANNON!

Saitama: I got one too.

As the energy beam came to Saitama.

Saitama: Killer Move: Serious Series: Serious punch!

Saitama unleashed one punch, splitting the attack in two, and, it caused the power core of the ship to erupt!

Boros: Did I ... lose?

Saitama: Oh, you're still conscious? Wow, you really are strong.

Boros: The prophecy was right. If was a challenging fight.

Saitama: It sure was.

Boros: Heh, don't lie. You had strength to spare. I barely even fazed you.

Boros disintegrated as Saitama walked off.

Back outside...

You saw the ship falling and-

(Y/N): HA!

You used Pyschic power like Tatsumaki and launched it into orbit!

(Y/N): Whew! That was close! WAIT, SAITAMA!!!

Saitama: Oh, there you guys are.

Saitama appeared.

(Y/N): Oh thank God!

Tatsumaki: What the?! Where did he come from?!

Ruby: He was in the ship!

???: MASTER!

Genos appeared.

Weiss: Genos, where were you? We could have used your help against that alien.

Yang: Or he would have gotten his ass kicked again.

Saitama: Hey guys. It's over.

Blake: Did you beat the leader?

Saitama: Yeah. I think he was the strongest guy I fought so far.

(Y/N): Really?

Genos: I suppose the prophecy may have come true if you weren't here.

Saitama: No; they don't come tr-

Tatsumaki: HOLD IT RIGHT THERE!

Tatsumaki called out.

Tatsumaki: I DON'T KNOE HOW YOU DID IT, BUT YOU WENT INTO THE SHIP ON YOUR OWN?! YOU'RE JUST A CLASS B! HOW DARE YOU OVERSTEP YOUR BOUNDARIES! I COULD HAVE DONE THIS BY MYSELF! BALDY! BALDY! OCTOPUS! BOILED EGG! LIGHTBULB! AVACADO! BEETLE HEAD! INSECT! BUG!

You all stared at her.

Saitama: Hey Genos.

Genos: Listen up you spoiled brat! Shut up and get lost! Or pay the price!

Saitama: THAT'S IT YEAH!

(Y/N): No, that's n-

Tatsumaki slammed Genos down on the ground, incapacitating him.

Tatsumaki: YOU METALLIC JACKASS! HOW DARE YOU CALL ME A BRAT! I'M OLDER THAN ALL OF YOU!

Yang: Then act like it!

Tatsumaki glared at Yang and lifted a giant piece of debris at her!

(Y/N): WHOA! Tatsumaki! Calm down!

Bang: Yes Tornado, let it go. You should know better than that.

Tatsumaki calmed down and blushed.

Tatsumkai: Tch! Fine!

Soon...

You and the girls helps repair City A and the Hero Association Headquarters!

It was clear that new roads would be forged from this!

And Ruby, Weiss, Blake, and Yang rose through the ranks of Class A! They were soon in the Top 10!