As an action fantasy story it’s fun, there are some pretty decent action scenes and the MC’s personality on the action side is hillarious. There’s magic, but as the title stated she mainly used modern firearms for combat with magic as support.
The otome side though… Initially it’s not that bad, but halfway through the story it becomes annoying due to how the author building the conclusion. The author take a lot of time to build supporting characters romance but neglected the MC’s side. The supporting character pairings have decent time to develop the chemistry while the MC’s just abruptly end with happily ever after without any major interaction between them. To make it worse, the author spent much more time to develop the stalking horse than the actual male lead, with MC interacting more with him and there’s actually some good scenes with them.
TLDR: fun action isekai, but a failure of romance genre.