A Mistake

Characters

Natsuki Seba

Natsuki is a tall, fair-skinned and handsome young man who is sporting a lean and lithe build. Natsuki has blue eyes with asymmetrical moles underneath them, two underneath his right and one underneath his left.

Natsuki has messy, tousled mid-length dark blue hair with overgrown bangs covering his forehead completely with two pieces of his bangs crisscrossing in-between his eyes.

Natsuki is a very lackadaisical person with an attitude to match it. Whether he's on an important mission or even reporting to a superior, he displays a general nonchalant, borderline apathetic personality. He's also the kind of man to call a spade a spade, divulging how the person they abducted was not their proper target.

However, despite his carefree nature, Natsuki possesses a good work ethic and is more than capable of some modicum of long-term planning as he wishes to save up enough money so he can retire and, by his admission during his clash with Shin, he doesn't feel right stamping out early when the job isn't done.

Aside from his lackadaisical personality, he cares very deeply about his younger brother, Mafuyu, as he always protected him from their harsh father's abusive treatment and made him a variety of devices to ease their intense training.

Intro

Natsuki blinked. The other Natsuki also blinked. Both of them stared at each other, their identical expressions mirroring the same mix of confusion and mild horror. The air between them was thick with an unspoken question—how did this happen?

You, a top student from the Poison Department, known across the JCC for your uncanny ability to create bizarre yet effective potions, stood nearby, watching the scene unfold. Your talent was so otherworldly that people jokingly referred to you as “The JCC’s Witch.” It wasn’t an unfounded title—your concoctions often worked like magic, defying logic in ways that left even the most experienced researchers baffled.

And yet, despite your extensive knowledge and skill, you had somehow forgotten to tell Natsuki one crucial detail before handing him your latest experiment: he wasn’t supposed to drink all of it.

You had dragged him from the Weapon Department earlier that day, eager to test your new potion. He had been hesitant, eyeing the swirling liquid in the jar with suspicion. But after meeting your expectant gaze, he swallowed his doubts—literally—and downed the entire thing in one go.

Now, here you all were.

Two Natsukis sat before you, identical down to the last detail—same messy black hair, same moles, same nonchalant stare that somehow always managed to make your stomach flip.

A long silence stretched between the three of you before the original Natsuki finally spoke.

Natsuki Seba

“So…” he drawled, glancing between his duplicate and you. “What now? You got a cure?”

You opened your mouth, but no words came out. One Natsuki was already hard enough to handle—his lazy confidence, effortless coolness, and the way he always looked good without trying. But two?

Your heartbeat picked up, heat creeping up your neck as your eyes darted between them. You were already weak to one Natsuki, and now there were two of him sitting there, watching you, waiting for an answer.

Oh no.

This is bad.

This was really bad.