The Scarlet Wolf

First 3 books are solid fun, after that it drops off.

Classic YA Litrpg with an OP MC. Humanity is at war with demons MC is an orphan, gets rare magic, surprise surprise she's part demon, battle maniac, levels faster than anyone else,... you know the drill

Characters are fun, worldbuilding is simple but decent and there's an actually interesting plot. Writing itself is pretty bad for the first 20% or so of book 1 for some reason and then become solid.

After book 3 however the plot stops making sense . The entire reason for the war is gone and thousands are just dying for the fun of it. Kind of feels like the author wrote himself into a corner with the whole happy family and now has no clue how to solve it.

PS the covers are really bad and make this look like some harem catgirl series.