In a world of Celestial and Infernal beings, along with terrestrials and many other life forms, where the main rule between the Celestial and Infernal immortals are not to come in contact with each other. This rule is known as the NIBCAI aka, No Interaction Between Celestial and Infernal. Even though the Infernal's motto is rules are mean't to be broken, they dare not break this rule. That doesn't apply for a few of them though.....
I can see some potential. I read a lot of novels like that, and this one could be very good. Though some dialogues do confuses me, and the whole SCHOOL thing is very....Special I guess you could say. The characters are still quite good and the setting of the story could lead to some very interesting situations. Especially the fact that Demons and Angels aren't supposed to interact with each others.
The story goes straight to the point and there's not much of info dumping happening ((and that's great since the author doesn't just fill a whole chapter explaining! Imo the plot has great potential so keep up the good work and update more frequently since I'm already hooked with your story! hahaha