I've always struggled to get through those lame parts in books. Not all books have these, but many do. It's those sections of the story where a big plot-point is resolved, but it's clear that there's still a lot of story to go, while simultaneously leaving the characters without anything clear to do.
This is the end of Volume 4 of Re:Zero, for me. It's so bad. The ending itself is OK---a little emotionally overwhelming---but the problem is the beginning of Volume 5. I didn't want to start it, because it felt like I'd gotten just enough closure, and the main character was too aimless for me to be interested.
I did end up picking it up, and it's good, by the way, but it is a very frustrating feeling.