The main attraction to yuri/shoujo ai titles for me, is the focus on the emotions of the characters. A quality guy/girl romance story will have some insight into the emotions of one, or both of the characters, that drives the relationship. But the emotions and thought process, and really the essence of love, isn't so important, because the average reader understands, and even expects, some kind of connection between two characters of the opposite sex. With yuri, it's a social taboo for the characters to have a romantic love for each other, so often, the focus of the story turns to what each charater is thinking, their rationalization for something they realize is out-of-the-norm. The focus is then, really, on the true meaning of love, or at least a character's rationalization of the experience. The whole, "This isn't normal, is it?", and "Is this love? But how can it be, when we're both girls?" experience is interesting, and exciting, and a good author will be able to convey those feelings to the reader.
Hanjuku Joshi, while not brilliant, is better than many yuri titles, in this regard. The characters, while simple and possibly lacking in depth, are cute, and easy to like. And unlike lots of titles that focus on the emotional aspect of things (and often only rarely even depict kissing), this delivers up-front. There's nudity and groping and kissing and even sex. Honestly, at times, the sex can feel like a distraction from what feels like the important aspects of the story (romance, emotions, etc), but I also can't honestly say I dislike it.
This title is a great read, if you're into what it contains, which makes me want to give it a great rating, but at the same time, it's nothing I would consider brilliant, or an important "must-read" of the genre. So a high 8 is where I settled, but ignoring the "it's not significant" aspect, it would have been mid-9s. I'm enjoying reading this.