I looked on amazon.com and on the internet and I couldn't find any references to there being an english version. I would really like to read so if anyone had any information on this it would be great if they could share it.
Puella Magi Oriko Magica is licensed in the US by Yen Press. The two volumes were released on July and October 2013. The continuation chapters: "Noisy Citrine," "Symmetry Diamond," and "The Last Agate" are collected in Mahou Shoujo Oriko Magica: Betsu Hen (Another Story), and the newest continuation, "Sadness Prayer" have not yet been licensed.