Nobody Told Me I Was an Undercover Agent

You transmigrated.

You transmigrated without knowing a thing.

The System assigned to guide you had barely refreshed your main quest when it announced that its battery was dead and it was going into hibernation, leaving you to fend for yourself.

[Main Quest: Kill ■■■■■]

You: Kill who???

Who knows? The System's mosaic is so artful.

Just as you were at a loss, the Water Hashira of the Demon Slayer Corps happened to pass by and picked you up. He even applied for disability benefits at the Wisteria House on your behalf.

You: Don't treat me like an idiot, hey!

During your days playing the fool at the Wisteria House, you learned that the Demon King had a name of exactly five characters. This couldn't be a coincidence. He had to be your target!

Overjoyed, you spent a month going from a fool picked up by the Water Hashira to his Tsuguko. You cut down demons like vegetables, and were just one Twelve Kizuki head away from becoming a Hashira.

Just then, the System woke up.

The System returned with a full battery and refreshed the mosaic with a single tap:

[Main Quest: Kill the Master of the Demon Slayer Corps]

You: Eyes widen in shock.jpg

So you really were an idiot (not really).

The System was utterly stunned: You're the worst I've ever had. May I ask if you never realized you were a demon?

You were even more stunned than the System: What do you mean, I'm a demon?

So the fact that you smelled burnt in the sunlight, were severely allergic to wisteria pollen, and found food tasteless as if your sense of taste had failed wasn't proof of your indomitable spirit in the face of disability!

You: How could this happen? Does this mean I won't get disability benefits anymore? (Deep grief)

*

Muzan: Three years, then three more. Has she succeeded in her infiltration?

Hello, the infiltrator has followed the boss of the opposing side and fought her way into the Infinity Castle.

Reader's Guide:

1. The main text is written in third person.

2. Pairing: Giyu and the fish.

Theme: Be hardworking and brave, and never give up