Kagerou Daze, Vol. 7 (light novel): From the Darkness

Now you see her, now you don't!
As a child, Tsubomi Kido rarely spoke. Just as she starts to find herself, with help from her older sister, tragedy strikes her home. When death approaches, Kido discovers the Kagerou Daze, where she meets a mysterious woman who grants her a powerful gift...or curse. In the outside" world of the present, the Mekakushi-dan gathers their combined strength to unravel the mystery that's ensnared them all!