It looks to be a sequel. Google Translate says something about turning eighteen (assuming Nana). It could also just be a Tankoban for the Harem series here as 176 pages does more or less cover the first five or six chapters. Guess we'll find out near the end of the month.
Unfortunately, as of today, EbookJapan was merged into Yahoo Japan and all content bought or otherwise cannot be viewed without the requirement of a Yahoo Japan account. All chapters that I bought with my own money are unviewable now as I don't have the means to make a Yahoo Japan account. It's...
@Metal-chan
Yeah until now whenever they mentioned Black Label in any capacity it was always a darkened image of Sarashina. Usually with his face full or partially hidden to imply they've yet to meet him and the story had yet to reach that point. But now we're going all the way out there what...
Recently got chapter six off EbookJapan. No bondage in this one but they do play around with word play (writing on someone, etc) and there seems to be a real heavy scene with Nana and her mom arguing. Looking forward to see what it's all about.
As an enormous NtK fan who's followed the series for years now, I just wanna say how awesome it is to see someone pick up this mid-quel and translate it. I was afraid I'd be forever stuck with raws from ebookJapan XD. Been trying to raise exposure of NtK for a while now on sights like deviantart...