Detective Conan: A Demon Slayer Corps Member's Retirement Journey in the Detective Conan World

[Primarily Detective Conan, with a slice-of-life feel + the sixth member of the Police Academy class + the protagonist is a true ally of the good guys! + no pairing, just one-sided crushes + giving various characters who deserved better a second chance + slow-paced plot + heavily altered timeline]

[Later crossovers with anime such as Bungo Stray Dogs and Jujutsu Kaisen]

Yishin Ubuyashiki, a Thunder Breathing swordsman who had successfully cut off Muzan Kibutsuji’s head, suddenly blacked out.

When he opened his eyes again, he found a sobbing System asking him to bind with it.

It needed him to play an NPC in a game called The Detective Conan Simulator, boost the game’s popularity, and pull it back from the brink of failure.

And so...

After going years without an update, The Detective Conan Simulator is about to receive a major update. It will add the Police Academy faction, expand the map beyond Tokyo, and introduce a host of brand-new characters.

After eagerly watching the trailer, countless players exclaimed:

“Holy crap, can the old man’s current art style really produce a character like this?”

“I heard on the forum that the new character uses a sword!”

“By the way, I don’t know if it’s a problem with my device, but have you noticed how Yishin-chan looks at us in several scenes...? How do I put it? It’s kind of affectionate. Is it okay to say that?”

After the game launched, Yishin Ubuyashiki, who considered himself old enough to be a grandpa, immersed himself in the joys of raising kids.

The kids were always giving him all kinds of weird things, but what could they possibly be doing wrong?

Later game events:

1. Yokohama shrouded in thick fog.

2. Jujutsu sorcerers burdened with a great responsibility.

3. The Demon King from a hundred years ago.

The NPCs gradually uncover the truth.