I would be very interested to know about an official English license for this series, but I haven't been able to turn anything up on the Internet. It doesn't seem to be advertised on the websites of Viz, Tokyopop, Kodansha, Yen Press, Seven Seas, Vertical, or One Peace Books. The cover of the scans linked seems to be the original Japanese cover, touting it as a YuriHime title, and no credits pages are provided. Searching amazon.com's "books" listing doesn't reveal anything remotely similar, and even broadly searching "katakura" turns up none of Katakura Ako's work.
If this is an official English translation, my guess is that it's not done by an American publisher. I'd still be interested to know where it's from and who publishes it.
(As far as I can tell, those scans follow American spelling conventions, but I noticed only one instance ["behavior" instead of "behaviour"]).