Original artist: harakei@pixiv

According to the August cover page for Monthly Shounen Sirius magazine, an OAD of the anime series, 「Princess Resurrection」 , is being produced. More details are to be found in the issue when it officially hit store shelves June 26th.

「Princess Resurrection」 — originally a supernatural manga written by Mitsunaga Yasunori — received a TV anime adaptation from Madhouse and aired for 26 episodes in April of 2007. The manga so far spans 11 volumes and is currently serialized in Monthly Shounen Sirius magazine. A drama CD was also released by Lantis in August of 2008.

[Source]