Well it's basically already been said.
There's no English release of the manga, the only way to read it in English is scanlations (which is illegal).
I fortunately had the chance to buy all 12 volumes of the manga in their original Japanese, brand new and fresh off the press, during my recent trip to Japan.
My next goal is to try and arrange a meet-up with the author on my next trip to Japan so I can have my books autographed! *fingers crossed*