By the way, a bunch of us have a bookmeter page listed in the 多読 thread, if you want some inspiration for adding books.
Thanks for that call out! Saved that and will definitely peruse. In general I lean on what my users request, rather than trying to guess the level of things and adding them myself 
. But anything super popular I like to add, so I’ll read through… may put my own goals too! I like the idea.
it’s really hard to compare the difficulty of novels versus manga
yeah I know haha. At the end of the day I wouldn’t stress too much (can always say you don’t know), but the data will be valuable. I haven’t really read advanced novels compared to advanced mangas… so would love to hear your thoughts 