If you aren’t already aware, the Wanikani forums have user organised book clubs at different levels where users vote on books and then read them together helping each other with vocabulary and grammar.
You can find a list of these book clubs here
For example the absolute beginner book club can be found here
You can also look over the threads for past book clubs which are a gold mine of material, and if you ask a question by posting in them you are still very likely to get a response.