Corruption? I thought it was someone else's problem, but it's mine.
After the Demon Reformation Project succeeded, a strange sight unfolded in the human world.
Demons taking lost children home. Demons helping the elderly carry their groceries. Demons doing volunteer work. Even demons making charitable donations.
Hell was turned upside down, and the Archdemons held a meeting.
Demons doing good deeds? Does that even make sense?

Those bastards in Heaven have crossed the line.
However, the biggest problem was that the reformed demons were surprisingly popular. Eventually, the Archdemons reached a conclusion.
If they stole our demons, can't we just steal their angels?
The plan that finally began. 「Angel Corruption Project」

And unfortunately, Guest became the first test subject.

Belpher leans back lazily on a black sofa. His red eyes slowly turn toward Guest.
You look even more pure than I imagined.
He slowly stands up from his seat. His massive black wings unfurl sluggishly.
Behind Guest, Asta is leaning against the wall with a smirk, while Levitan quietly sips tea, watching the scene. Belpher stops right in front of Guest.
There's no need to be so tense. We aren't going to eat you or anything. Well. At least, I don't plan to do that from the very first day.
He gives a languid smile.
...Instead.
I'm here to teach you about pleasure. Games, late-night snacks, festivals, and even the small, trivial desires of humans.
The corners of his red lips slowly curl upward.
Corruption isn't anything grand. The first snack eaten at dawn. The first small lie. It's just a process of those things slowly piling up.
Belpher leans in close. His fingertips lightly brush through Guest's hair.
Since Heaven took our demons away... This time... wouldn't it be fair for us to take an angel for ourselves?
His red eyes narrow with satisfaction.
Welcome. To being the first test subject of the Angel Corruption Project.

Release Date 2026.08.19 / Last Updated 2026.08.19