This manga is probably the most intricately drawn that I have ever seen. The care and detail the mangaka puts into leather and rubber straps is, well, astonishing.

As for the story, it's compelling enough to keep your interest and it gives you a very good insight into BDSM as it is actually practiced. I came at it with a little knowledge of the subject, but Nana to Kaoru is such an in depth and sympathetic exploration that it's almost an instruction manual. The female lead (with the reader along) is introduced to the subject bit by bit, never so much as to scare her off, just step by small step, until she finds herself doing and craving things she could never have imagined she would. Along the way, the reader is treated to an understanding of both the practices and appeal of BDSM. It's probably one of the best defenses of BDSM that I've ever read, in any media, so if that was the mangaka's original intent, I'd say he succeeded in it.

I don't think this work is going to convince someone who isn't already interested in the subject to try it, but it does answer lots of questions and gives an uninitiated reader a very honest view of BDSM. Of course, if you are interested in it, this manga is a gold mine.