One day Harry was running on the pavement as he tried to escape Dudley's gang but slipped and fell. Due to a culmination of working a lot, eating very less, and generally very poorly treated, Harry would not live to see another day in this world.

He died exactly pi seconds after he fell.

But this was not the end of the line for Harry. Maybe he couldn't live in this world any longer but that didn't mean he could not go into another world. Due to being the strongest wizard alive, more powerful than Dumbledore, Voldemort and so many other countless weird names combined, he was able to open a cross-dimensional portal exactly pi/2 seconds before he died.

But there were still side effects.

Harry Potter landed in a strange world as a cockroach

He gained a harem as per usual because he is Harry Potter.

Then he and his entire harem got killed when Sally's late uncle stepped on them.

May he rest in peace.

The End.

(I'm sorry)