Look to be clear this is a light novel. Maybe it doesn't look like but the title of this should be. 
How I ended up in the dungeon with nothing but my cat, underwear, and dynamite. 
Taking this book as what it is. It's tremendous fun. The action goes fast enough to almost make you forget how horribly bleak the setting is. It's a decent take on the genre and compared to something like solo leveling, omvient readers viewpoint, or even any power scaling dungeon, crawling book it comes off less serious and more lovable. 
Now to be clear this book comes with a pretty big list of trigger warnings. If none of those bother you and you want something fun. It's a pretty good read.

I really enjoyed this! At first, I thought it might be aimed at a younger audience, but it actually tackles some dark, complex themes.

The story has a clear dungeon crawler feel, and anyone familiar with RPGs will recognize the parallels. The action is fun and fast-paced, with battles that often come with moral dilemmas, adding emotional depth. I could easily see this adapted into an adult animated series with minimal changes.

While I'm unsure if it will have a happy ending, it feels like it’s setting up for a tragic one. However, with many books in the series, that likely won’t happen anytime soon. I'm excited to keep reading!