AfterLife

Katsuki knew how to see through people, it was something he was proud of. Something that would make him a great hero someday, he knew. And the person Deku was today, was not the same as nine months back.

But he couldn't for the life of him, even after five months of deep observation, figure out the reason for the change. At least, not any logical reasons.

Deku, Deku, Deku, Deku... His mind was at it again, the clashing temperatures no longer muting his fucked-up obsession. Because it had become one, an obsession with trying to find more answers, the final clue that would solve the enigma.

_____________________________________

Izuku Midoriya died. Not that anyone noticed.
His mother carried on with her life unknowing of such tragedy. His middle school still graded his papers and marked his assistance in class. The world had lost a hero but was none the wiser.

Or; All Might came late to the rescue the day of the slime villain attack leaving Izuku Midoriya to die.
...

Oh, and his body got possessed by a transmigrated reader who just tries to adapt as best as he can.