Mystery of the Shijou Mansion

My favorite idol in the game Idolm@ster, Takane Shijou, is part of this story. But, in a different way. Her house holds a secret that has just been revealed to her. She has decided to tell one of the other idols, Hibiki. She and Hibiki decide to investigate at the Shijou mansion. Together, Takane and Hibiki may be able to uncover the mystery of the Shijou mansion.