Not only that, for me Grimwar is the second best example of what kind of most people end up in isekai with thousands of years live live in that situation (my first for me is Eris Miserian) It's not all cupcakes and rainbows and that it's normal for him to be desperate and have flaws for having that kind of life. It's also refreshing that he just doesn't accept the bullshit that 'Oh I reincarnated guess I just live on without care' like it's expected for him to be quite obsessed on why and how he ended up on that world and find answers and have a true huge impact in that world because of that. That his actions have consequences that shaped history of that world.
Normally stories like this get passed by so easily especially ones with A Woman MC thats not a historical romance, this is so good and doesn't deserve to be as underrated as it is. I love all the characters and the pacing is great. Even though it's similar to a lot of "MC uses overpowered unknown methods to get strong in a short amount of time" it's actually interesting because I think it's done differently. Plus it's refreshing to see two main characters in one story and they aren't love interests. Overall great read and deserves higher ratings and more recognition. (Only downside is the dumbass long version of the title)