After a dangerous encounter with a malevolent spirit, Keitaro Gentoga wants nothing to do with the supernatural. Unfortunately for this reluctant ghost magnet, he's stuck helping Yayoi Hozuki--a strange young girl who's intent on capturing Japan's most terrifying ghosts and ghouls.

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?