Discommunication: Seirei-hen

Takaomi and Arika meet a young girl named Tsugumi Yoshimoto who has been asleep since an incident that occurred when she was a child. What happened in her past? And can she be cured? The couple try to solve this mystery with the help of the Mishima sisters -- Toko and Rinko, who are 'Yumetsukais' (d