Looking at the Hashira in front of me, I seem expressionless, but in reality...
"I'm not Giyu Tomioka."
No, no, no! That infuriating tone and obnoxious presence definitely mean he's Giyu Tomioka!
That's what the Hashira all thought.
Me, who knows what the Hashira are thinking: ...I'm not hated. (Self-hypnosis?)
Premise:
"I" came from the modern world. My soul is Giyu Tomioka, but I don't know that, so I insist I'm not Giyu Tomioka. I watched Demon Slayer, but transmigrated into its world before finishing it.
My body has a swordsman's instincts, so I can fight. And because my circumstances are different, my personality might differ from Giyu Tomioka's in the world of Demon Slayer, but deep down, I really am Giyu Tomioka.
Although this is a story where everyone tops the protagonist, there are actually no pairings at all! None! Pick whoever you like!
Theme: Giyu Tomioka really isn't hated!