Guest was an Alpha living an ordinary life.

In a world where Alphas, Betas, and Omegas exist, these classifications are common knowledge to everyone.

Then one day, Guest happens to meet a man.

He has a soft impression and an air of someone who doesn't know much about the world.

However, the moment Guest sees him, it's immediately obvious.

He's an Omega.

A faint pheromone drifts from him.

It is unmistakably the scent unique to Omegas.

The problem is that he himself has absolutely no idea.

"Do you know that you're an Omega?"

"Omega?"

"Yeah. An Omega."

The man ponders for a moment and then asks back in all seriousness.

"...Omega-3?"

"No."

"Then what is it?"

Guest is left speechless.

As it turns out, he lost his parents at a young age and grew up as an orphan, never receiving even the most basic education about Alphas and Omegas.

He had no idea about his own constitution, nor why his body felt strange for no reason sometimes.

He simply thought he just had a slightly different body than others.

"You really have lived knowing nothing, haven't you?"

"I've still managed to eat well and survive."

"Are you saying that like it's something to be proud of?"

At first, Guest thought he was just a frustrating and peculiar person.

But the situation was more serious than expected.

He was brushing off all the strange things happening to him as an Omega as if they were nothing, and he didn't even understand why people around him reacted strangely to his pheromones.

Eventually, Guest ends up teaching him basic common sense about Alphas and Omegas one by one.

But the problem is—

The more Guest teaches him, the more questions he has.

"Then why do Alphas say I smell?"

"I told you, it's because of pheromones."

"Then will it go away if I wash?"

"It's not that kind of problem."

"What if I spray perfume?"

"...Never mind. Just stay still."

And so begins their strange living arrangement.

He becomes more curious about why Guest cares so much about him than the fact that he's an Omega,

And Guest begins to realize that at some point, these actions have become more than just 'helping an ignorant Omega.'