Strongest Salaryman

On Earth, The monster and aliens suddenly started to invade.
Humanity despite struggling at first started to cope with it. With the help of newly gained powers humanity fought back.
But not everything is perfect, something in its initial state can't stop what is already transformed.
To stop it there was a being that nobody knew of. No one was ever alive to tell his tales.
He may be a savior to humanity and a looming disaster to its enemy. Or maybe both.
No one knows, until one day a teen met this being which changed his life and the people of his surroundings too.

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Hi, it's stumbling here. This is about an overpowered MC. This story is pure fun, and hype, and sometimes will give chuckles. Don't expect deep stuff. So if you like it, you can give it a try.
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The cover is mine, if you have an issue please don't contact me. ;)