Dark Gathering Graphic Novel Volume 13

With Yayoi incapacitated by a deadly curse and the streets swarming with beastly spirits, Kei and Eiko have no choice but to unleash the terrifyingly powerful Black Asura in Lunar Umbra. However, while his sketchbook is more than enough to make short work of the massed spirits, will it be enough to overcome the demonic puppet master who's pulling their strings?