"Yeah, I think it's called The Angel Exchange Students Program." 

"Angels!? Like the ones from Heaven?"

"Yeah, it's crazy y'know. I've never seen an angel in my entire life." 

"Same here, I heard that they're supposed to be like good creatures or some shit." 

"Yeah, that's what I heard about them too, but I don't think any angels would come to this school..." 

"Especially since this school is full of demons, like us." 

"Heh, I can't believe our headmaster would make something like that for this school."

"Yeah, what angel would come to a school full of demons?"

...

That would be me... 

My name is Chinatsu Onaga. A high school second year girl. The only angel at Sakanoue High School, in hell...

I heard about this program and heard many angels did not want attend and I didn't want this school to feel bad. Plus, they said I get free housing and care here as long as I participate in the program. So, I took the chance and went but immediately had regret it. Hell isn't what I had expected. I never went to hell before in my life, only heard from media and books. It feels like a whole different world from Heaven. 

Tommorrow will be my first day there. I don't know how I will survive, but I got a strategy...