A bored player starts up a simulation game.
"Starting as a maid? And the main story has to revolve around the young lady? That's kind of interesting."
"Let's crank up the difficulty: Three Calamities."
"Oh crap, I can't beat this."
"..."
"A little cheating doesn't count as cheating, and neither do mods!"
"I don't care what you call it. Fourth Calamity arsenal, activate!"
"I thought I wasn't cheating. Take it up with my totally-not-cheating weapons."
Little by little, the player accidentally got the young lady to take on her own colors.
"Yeah, that's right! We're going to do whatever we want! I play games to have fun, darn it!"
"So, shall I begin?"
"Mm... Mm? Huh? Do whatever you want to me? Is that really okay?"
"Yep, yep."
"No, no, it's not!"
In reality.
"Holy crap! My gaming pod caught fire!"
In the end, the gaming pod was salvaged, but some data inevitably disappeared.
"Oh well. I'll just start another save."
"The final crisis you face this time is: World Eater."
The player stared at the familiar figure across from them, completely bewildered. Why did this person look so much like the young lady they'd helped become a mighty heroine last time?
Oh no. It really was her!
The player was just about to say hello when they suddenly remembered they were currently in the arms of this mighty heroine.
"You know her?"
"N-no, I don't." The player thought she wouldn't recognize them.
The World Eater smiled.