Loser transmigrates into the ultimate mash-up novel he wrote himself.
The Gender-Ambiguous Knight King Saves the Witch, Beats the Demon Lord, Journeys Across the Sea of Stars, and Takes Down Aliens
The setting mashes together Release That Witch, Dawn Zero Sword, and Big Dragon Hang La, then throws in Japanese-style Demon Lord and Hero RPG elements. It's all one big stew.
Then he turns the Demon Lord, witches, the emperor, and the aliens into all kinds of women, so the hero Artoria can journey across the sea of stars and conquer women at the same time.
This sounds like a truly wonderful world.
There are tons of beautiful girls to conquer.
It doesn't matter if you become the Demon Lord, an alien, or even the gender-ambiguous Knight King. Anything goes.
Even if you change gender and become a witch, as long as you're strong enough, it really doesn't matter.
But
"How am I supposed to play this when I've become a minor noble who's killed by the protagonist in the first ten chapters?"
"The demon clans are invading, the gods are watching, and the Church is eyeing us hungrily. This world is way too dangerous."
"Most importantly, my predecessor has already kidnapped the protagonist's childhood friend and locked her in the basement."
"But... I'm going to die anyway. Should I just go all the way?"
Luther gazed thoughtfully at the beautiful girl bound in chains.