Nein - 9th Story

In an old antique store off a back alley, the vocalist of Vanishing Starlight discovers a futuristic information terminal in the form of a pair of sunglasses with the ability to transcend time and space. He's then possessed by a mysterious cat being, and his adventure begins.

Note: This manga is an omnibus collaboration between several artists, based on the fantasy band Sound Horizon's 9th Story CD, Nein, which depicted some of their earlier stories in "what if" scenarios.