Ayakashi (アヤカシ, Ayakashi?) is a 2005 visual novel developed by Crossnet. An eroge sequel was later released in 2006 with the name Ayakashi H. A twelve-episode anime adaptation was aired in 2007. A bundle release of the game called Ayakashi Pack was released on December 14, 2007 to celebrate the release of the anime, containing both Ayakashi and Ayakashi H.

Source: Wikipedia