There are seven things "wrong" with the relationship between Otome and Minato.
They are a couple with (1) a thirteen years age difference, (2) both girls, (3) a child and an adult, (4) a teacher and her student, (5) a mother and daughter relationship that's not blood related, and (6) they live together, not to mention that their being together is (7) against the law. For all these reasons I love this couple.
Unlike Shoujo Sect, Kurogane Ken leaves out the smut and focuses more on the romance between Otome and Sensei. Their love continues to evolve and grow with every page of the manga
and there are many times when their love is palpable and raw. Their story never stops progressing and never loses interest, successfully captivating the reader with their forbidden relationship. I cannot think of any other manga that has a similar plot or setting as Hoshikawa Ginza Yonchoume.
However, as perfect as I'd like it to be, this manga falls short at several points. Without spoiling anything, I'll just say that near the end, the plot seems to have been changed with something quite disturbing (at least to me T_T) because the mangaka ran out of ideas or felt like he needed to throw a surprise or succumbed to his tendency to draw smut (but not quite smut here) or the editor threatened him to do something different or whatever it was, it dropped my rating of perfection for this manga. Another downfall is its length. The ending could have been spreaded out in more volumes, but perhaps the mangaka wanted to end this series quickly and thus changed the plot accordingly.
That being said, I'd rate this manga a 9 out of 10 for having very well developed romance and heart-shaking moments with a unique setting and interesting story. This is one of my favorite mangas to read. I've reread this manga many times, and every time I get the same electric feeling that comes from love that the characters probably feel from each other.
I'd write a less-biased review, but I think a review coming from a fangirl of this manga helps lay out the emotions you might get from reading this manga as well, and also because the reader's feelings are an important part in deciding the rating of a manga. If I had to recommend a manga to a fellow yuri-lover, this is it! Thanks for reading!
If this review isn't enough to encourage you to read Hoshikawa Ginza Yonchoume, send me a message and I'll try my best to convince you otherwise!