I Write a Diary in Demon Slayer, and the Goddess Has Lost It!

He's kind to his own people, but a total sadist toward ghosts, relentlessly torturing them. This story has a lot going on. Su Yu finds himself in Demon Slayer. He can grow stronger simply by writing in his diary every day, but he has no idea that others can read it.

From the start, he gets Zoro's swordsmanship. He thinks he can launch straight into his path to becoming an overpowered hero, only to discover that this swordsmanship comes with a built-in navigation debuff! He gets lost as soon as he turns a corner, turning into a hopeless directionless idiot out of nowhere. Su Yu is so frustrated he has no way to vent.

But when he gets "Undead Slayer," which lets him inflict more damage on ghosts, his whole demeanor changes.

"So you're a ghost, huh? You like eating people, huh? You think you're evil? I'm worse than you!" And so...

The tone of Su Yu's diary changes too.

I took down a few more ghosts today. I've been lost and frustrated for so long, and now I can finally vent!

Don't run! Aren't you so good at eating people? Let's see who kills whom now!

The ghosts' screams are so delightful. You can scream until your throat gives out, but no ghost is coming to save you. Just give up!

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.