I want to see their reactions when he tells them about his world, monsters, his own full power and the most powerful people over there... including Bang, Tatsumaki and of course Saitama...
loved the story... the fight was epic...

With the exception of autonomic processes like breathing and your heartbeat, everything you do is at the command of your brain, please stop saying that so-and-so’s fist clenched at the command of his brain, or his arms were brought foreword at the command of his brain, or his foot stepped shoreward at the command of his brain, or his arm cocked back at the command of his brain. You might as well remind me, with every breath, that they’re breathing so they can get oxygen in their bloodstream so it can be distributed to the various cells in their body to be used in cellular respiration to produce Adenosine Triphosphate to be used in the assorted cellular processes required to keep hmthem alive. All of this done at the command of their spinal chord as it is an autonomic process.

Unless it’s being done telepathically there’s no need to mention something being done at the command of someone’s brain.

“His hand, at the command of his brain, flicked she switch.” No.

“The switch across the room suddenly switched at the telepathic command of his brain.” Fine.

“His hand, arm, and finger, all at the command of his brain, input the passcode to unlock the door.” No.

“With nothing more than his brain, and the implanted computer chip, he imput the passcode and unlocked the door.” Fine.

First:

M.H.A or rather, B.N.H.A as is officially considered for acronym's,
is darker in certain moment's, Rated M, for a reason, the same can be said of One Punch,
so, The best idea at present, is to change the rating, to Teen, it gives more freedom,
and allows for more, intense scene's, in most cases.

Second:

I truly wish, the chapter's were longer, MUCH, longer.

Third:

There are not, if at all, even any time-skip's, one minute, one hour, one day, whatever,
that is the most basic way of saying how much time had passed between each scene that occurs.

End Review.

Please don't give Midoriya special treatment. I feel like he is often prized over other characters with potential due to how OP his quirk is. It is your story, I just think focussing more on Genos's interactions with other characters may support your story and keep it from turning into the cliche "other OP character teaches Midoriya" because it does become boring.

That said, I found your writing style fantastic, and your characterization is of Genius is really well done. Please note that this is not meant to hate on your plot, these are just my personal thoughts. I hope you take them into consideration!

Thanks for the chapter!

Please continue.

Looks like we have a possible ship.

Interesting...

DAM.

HOW ?!
How he hurt genos ?

WHY THE HELL GENOS DONT JUST BURN THE HECK OUT OF THAT JACKASS ?!

YES.

BREAK HIS LEGS !

HE JUST KICK THE ASS OF ALL FOR ONE !

The OPM heroes are OP.
All for one is done.