I gotta agree that Yanu, while morally ambiguous still felt like the good guy in the end. It was really well done. Though I think what really helped was the fact that Eyra really isn't as normal as he tries to present himself as (I do think he doesn't realise it himself though lol).
And I felt the same about the pacing as you do, before reading the novel. I really liked it as a stand alone, though after reading the novel, I gotta agree with others, that the ending felt rushed in comparison. However, I wouldn't have really noticed if I didn't read it. And the novel did a better job at explaining the nuance of some of the things that happened. They kinda reduced the complexity in the comic - I presume they didn't wanna deag it out.
I hope you have fun reading the novel!!!

Yanu had me blushing at MULTIPLE points! They did a really good job of adapting the right amount of otome game tropes while still letting it be a "real" world. Plus Yanu is truly a chaotic neutral character, almost chaotic evil, and yet still VERY likeable as a main "good guy". It was really good and definitely hard to pull off considering how many fine lines they had to walk in order for everything to fit AND be enjoyable. Really impressive writing!
All the complaints I've seen are from people who've read the book and said the second season is basically two seasons rushed into one. That's fair, but to be expected as the visual adaptation of well-loved books RARELY meet the standards fans hold.
As someone who didn't read the book, I didn't feel like it was rushed at all. I definitely want more, but that's just because I enjoy it. So I'm glad i read the comic first since now I'm excited to read the book, I get to enjoy both!