Note: The final cp is Xue Lin, and other cps are a matter of judgment. It's not Shiemi, and it's definitely not a Mary Sue. Also, I didn't see any issues like why the protagonist is a female at the end.
The setting respects the original work and animation. The plot is based on the daily life before the invasion of Satan in the animation and before the Knights riot broke out. Demons can travel through the void material world at will and are invisible to ordinary people. Demons do not feed on humans.
There are two perspectives in the text, the first perspective of the protagonist and the third perspective centered on the Okumura brothers for convenience of narration. It is easy to distinguish.
There are some OOC characters (especially the Chairman, I am not good at depicting characters who have no idea what they are thinking), and there are some black characters.
Anyway, thanks for watching.
Intention: Intention to be added