Yeah, I can very much relate to that. After all, a book’s level is just a (more and more educated) guess, no matter what 
Anyways, I got really curious now regarding that book! It being an Akutagawa prize winner sort of already sticks the “it will be complicated and confusing” tag to it ime 
but then again, here everybody rated it as “minimal difficulty” . Maybe I will have a look into it at some point 