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Tales of the Otori, looking for the difference between these books? - very young bbs

So I was browsing Amazon to add for the next book in my collection and I came across two different copies of the Tales of series "Otori. One thing is for young adults, can be found here: http://www. Amazon.com / Across Nightingale -Floor-Episode-Warrior/dp/0142403245/ref = sr_1_9/104-8258543-3914354? ie = UTF8 & s = books & qid = 1183344406 & sr = 1-9

The other, here: http://www.amazon.com/Across-Nightingale-Floor-Tales-Otori/dp/1573223328/ref=pd_bbs_sr_1/104-8258543-3914354?ie=UTF8&s=books&qid=1183344406&sr=1- 1 additional pages contain.

I guess my question is: this book is for adults and adolescents? Can anyone tell me about this series? I am an adult, and I am looking for something attractive with the development of the real character and style.