The first chapter sets the tone of the story rather well. The FL witnesses a murder and has her life threatened and her first reaction is about how beautiful he is. This right here tells you that the author is going to sacrifice common sense for "b.c author said so" moments, and this story does not disappoint.
To start off the girl is supposed to be someone in college who may have died from studying too hard for finals. She doesn't come off as studious, focused or mature as the backstory makes her out to be, she feels more like a teen with how short sighted her plans are. For example her first plan is to get back to her world by traveling to the capital where the portal to her world should open according to the story. However, timing is important if she is to make use of that portal, the story never mentions when in the story the FL has awaken in, and it never indicates that the FL knows either. Shouldn't she be concerned about if the story has started yet? But she isn't and that could make her miss her chance to get back home. Maybe she does and the author just forgot to tell the reader?
We get a b.c author said so moment when the FL is being threatened by the ML, he says he will kill her if she makes a sound and her response is "I don't know if this is really Radeiel because somehow he is acting differently. She proceeds to explain that Radeiel has a twisted and dark heart, so I guess holding a knife to her neck and threatening to kill her means he has a pure and innocent heart? How hard is it to just let her not realize who he is b.c of the fear she should be feeling during this scene. You wouldn't have to make up stupid excuses for why she can't recognize a character if you just let the scene do its job to the characters in it.
The FL also makes a point of mentioning that Radeiel is willing to kill even those he loves to achieve his goals, so you would think the author is trying to lay the ground work for why the FL will have to deal cautiously with Radeiel and maybe even avoid him if possible since she the FL knows this about him, but no, this piece of dialog given to the audience in no way affects how the FL will interact with Radeiel. Maybe in about 40 chapters after it is never referenced again Radeiel will try to backstab her and we the audience can say: SEE, back in chapter 2 the FL said he was capable of killing those he loved" while we roll or eyes at how useless the information fed us by the author is to the overall story.
I don't understand why the author keeps revealing details about the characters or the world and making the characters completely disregard everything that was just revealed, why even bother mentioning it? The author isn't even highlighting these traits to explain how unexpectedly different people are acting, its just an exposition dump that doesn't add anything to the story. The characters don't care about the scenes they are in, the FL doesn't care about the information she has on Radeiel, nothing matters b.c everything moves not because of the backstories created for the characters, but b.c the author wants this or that to happen.
I wrote this after reaching chapter 4 and the way Radeiel convinced the FL to accept a job that could cost them their life just sells my point that the story moves b.c author said so.