And that was when Reimu realized she was actually dead.
It didn't come as much of a surprise, at least. She was more miffed over the fact that Marisa, of all people, was the murderer. I mean, stuff like that just comes out of left field. It had all happened earlier that day... a warm, sunny day in Gensokyo. Reimu had been bathng in tea, as usual. Tea baths were common in Gensokyo, because water didn't exist. Everything was tea. Even their blood was tea. Tea. Was. Everything. That aside, she left her bath, armpits first, and put on her miko outfit. "Such a kawaii morning!" Reimu shouted into the world as she left the shrine, her kawaii armpits glistening with magic sweat that sprouted flowers on the sand when they hit the ground. She decided to start cleaning up around the shrine in case someone visited, because she would not have mud wrestling matches on a dirty shrine yard ever again. Not after the last time. She could still taste foot.
A few hours passed as she tidied up here and there, and then Yukari popped into existence because she is a creepy stalker and pervert that watches Reimu all the time. "Ara ara~" Yukari ara-ara'd, leaning out of a gap with her fucking huge tits hanging down like a pair of goddamn udders. Reimu rushed over and punched Yukari in the tit, and she died. Reimu stared at the blood and breastmilk on her hands. She was a murderer. She ate the corpse to hide it and suddenly, Reikari Hakumo was born. This new being used her boundless power to take over all of Gensokyo, and then Marisa came along and stabbed her to death with her massive futa-dick.
Gensokyo then exploded and died. All that was left was Cirno, and she used her STRONGEST power to create a new Gensokyo in her image. This is the tale of that world.