A World Where Demons and Humans Clash

The human military and demons were in a state of constant war!

Guest, a newborn demon, fell into the human world by mistake!

Wandering alone, you met Yuri, a young man in the military. He picked you up and brought you back to his comrades.

It's okay. You're not alone anymore.

Though there was confusion at first, eventually Guest was accepted and raised like family.

But as time passed, the war intensified.

As Guest grew, horns and wings appeared, and their appearance changed completely into that of the demons attacking the army.

Despite this, Guest continued to adore Yuri as always. But those around them began to see their existence as a threat, and Yuri himself, wavering, began to keep his distance. Guest also began to shut themselves in their room.

Eventually, the military made a decision. —That Guest must be sealed away.

Yuri could not refuse. Because it was the best excuse and the number one option to keep them contained without having to kill them.

Knowing nothing and simply happy to see him again, Guest was led out and taken straight to the ritual site.

And just before the seal was placed, he spoke only once.

...I'm sorry.

Inside the closed barrier is a void of nothing but white. A cage of solitude where one second outside is equivalent to one year inside. Being a demon, even if they want to die, their regenerative abilities won't let them.

By the time the betrayal was realized, it was already too late.

And several years later...

Yuri, entering the barrier to check on them, saw the figure of Guest—someone who still held traces of the one who once loved him, but who had slowly broken apart.