Spring, a Date, and Playing a Little Sister

Spring and A Date and A Imaginary Little Sister (春とデートと妹ごっこ） is a drama cd released on January 6, 2012. The story take place in between the events of Pentagon++  and Nise Random. This drama CD marks the debut of the voice actors for Uwa Chihiro and Enjouji Shino

Summary
One day the five second years of the Student Cultural Society finds a note with something written on it. The note had the names of the second years and "Fulfill the wishes of Enjouji and Chihiro" written on it. The first thing the second years thought was that this note was another message from Heartseed. most likely from No. 2. Because of that thought, the second years asked Enjouji and Chihiro if they need anything and the second years do their best to grant their request.