Kanon Wakeshima
Four pieces of theme music are used for the episodes: two opening themes and two closing themes. The opening theme for the first season is by On/Off, and the closing theme is "Still Doll" by Kanon Wakeshima. The opening theme of the second season is by On/Off, and the ending theme is by Kanon Wakeshima. The original soundtrack for the series was released on June 25, 2008.