I really enjoyed this series! It was a really enjoyable time.. up until a certain chapter. After that, my enjoyment went down significantly.
It was a really fresh experience with how passionate the love was, and the drama fed that passion well. I especially liked the overly determined Hitomi, the female lead. Any time there was any doubt or weakness, she was the one to stand strong against the storms crashing into the forbidden love. It was refreshing for someone to say, "I don't care, I love you and don't want to give up!" The rest of the cast is fine, but she is the star of the show... until chapter 40.
Chapter 40 is where I say the manga stumbles hard from what I felt was a great story to an okay one. I won't say what event occurs, but it changes Hitomi's character significantly and in a negative way. There are moments where her old self flashes in, but that isn't enough. The drama has nothing to resist it, and the love that is there twists into a form that is far more bitter than sweet. The moment "Shin-senpai" became "Onii-chan," something was changed, never to return. It hurt me as a reader, and it hurts even now as I type this.
8/10 Would I recommend this? Through chapter 39, wholeheartedly! I would say that section is a 9/10, easy! From 40 onwards..? It hurts, and it's dramatic... it's still worth reading. I'm not sure how strong of rereadability it has, though I may just read to chapter 40 if I do.