Kanon Wakeshima
The series uses four pieces of theme music. The opening themes of both the first and second season are performed by the duo On/Off, with as the opening for the first season, and as the opening for the second one. Kanon Wakeshima performs the first season ending theme, "Still Doll", and also the second season's ending theme . The soundtrack is composed by Takefumi Haketa and consists of 30 tracks (including the opening theme and ending theme).