[!Warning! This is a slow burn harem, it will be secondary to the plot but still prevalent, you have been warned.

I own nothing.]
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All for One had won, All Might was dead, and Izuku was no longer able to fight.

All around him, Mirio could only watch as his friends perished one by one, unable to do anything worthwhile despite the power he was given.

As a result, Mirio finally gives up and accepts his fate, promising pointless revenge as All for One laughs in his face and reduces him to ash.

However, for better or worse, Mirio Togata was not greeted by death.

Naked and unsure if what he is seeing is all but an illusion, he slowly comes to find himself in the past of an alternate world.

One where he died young, and to make matters even worse, he is currently stuck ten years before Izuku enters UA and all hell breaks loose.

With newfound determination to make things right, fix the wrongs of society, and guarantee the heroes are ready, Mirio sets his sights on a new plan.

Now, with his signature smile, a good helping of an urge to kill a centuries old villain, Mirio finds himself standing before the infamous Class 1-A as their teacher.

However, no one said being a teacher was going to be easy, especially when some of his fellow teachers and Heroes, specifically of the female variety, all want a piece of him for themselves.
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“Hello students," Mirio couldn't help but smile. "Put these on and head outside to the P.E. Grounds immediately."