After a shocking and hardcore first chapter, the story is now more "normal" in a good way, like taking a deep breath and finally relaxing... For the time being, I have the feel that one of the boys is going to die at some point.
Something that I was thinking is that despite being 150+ years old, it's not like Lisa had a lot of stimulation in that time period.
She didn't have people to talk about so she didn't have a chance to develop socially, she didn't have books to read so she couldn't acquire more knowledge, she couldn't go places because it was a blank pocket dimension, etc, not a lot of stimulation other than raw training.
The only thing she had was essentially her own mind and the few things she knew in her first life, so yeah she lived a lot and could come up with some tricks like the magic combo to split the sword, and now she has this theory about the dragons still existing, they're all things that you could eventually theorize with enough time but she still isn't truly like one of those "150 years old vampires that saw everything that the world has to offer" in some fiction works, her life experience is still roughly the same.