I can't recommend this series highly enough. It's short, funny, and still manages to capture your heart. The romance is subtle, which I appreciate, and doesn't really happen until after
Shin graduates and you only really see this fleshed out in the extras.
There are so many things going on but the heart of the manga stays the same - Yankumi's love of her students and how she uses her strength to push them forward. She really is their ally and watches out for them. Because the story chapters are shorter, there's never a sense of being bogged down with a long, boring arc. It moves fast.
As an adult reading it, I can see a lot of really good things I never noticed before...
How Yankumi really doesn't view Shin as a romantic partner at all, which I appreciate since she is his teacher, but how she does rely on him and highly esteem him. How Shinohara doesn't really appreciate Yankumi's absolute wildness but would rather ask her to tone it down while Shin just follows hard after. The conversation between Shin and Shinohara is probably my favorite -- he really gets involved because he chooses to, he wants to pursue law because of them and to help them, and not because he feels forced to repay a debt.
Like I said, I've read this manga so many times and it never fails to comfort and warm my heart. It's a comedy, so there are gag things, but the heart of the story is what makes you come back over and over again.