It’s here! Just a couple days ago, I finally got the last Japanese Grammar dictionary: A Dictionary of Advanced Japanese Grammar. I cannot stress enough how helpful it is to have these dictionaries around. Each dictionary has around 200 grammar points for a total of 600. There are detailed explanations, example sentences, and related grammar. You are also able to look up grammar based on its English equivalent, which is nice if you’re stuck on how you want to say a particular thing.
My only issue with these was that different nuances between similar grammar are often not explained. The Kanzen Master grammar book (I’m using N2) does a good job explaining the subtle nuances between similar grammar points, but the dictionary is also good for explaining when to use specific variations of a grammar point, which otherwise is not often covered in the Kanzen Master grammar book.
Although a little pricey ($40-$50+ US per book), these dictionaries are definitely worth it for anyone wanting to study Japanese and make sense of grammar. They’re also good references for not only when you’re studying but watching or reading media in Japanese.