'The Vivians', a close lesbian couple, are entering a period of boredom! - ? - Lately, they haven't had much time to see each other, and it seems like they're just passing each other every day...Tsukishima, in particular, seems worried about whether Shiina, who they haven't been able to see lately, really loves him. - So this time, Vivians decided to perform a ``private prank'' on Sora Shiina to confirm her love for Tsukishima! - Will Shiina end up cheating on Tsukishima secretly? - ? - And there is an incredible ``back'' to this project! - ?