The 'Close Lesbian Couple' Vivian's' is entering a period of stagnation!? Recently, they have been seeing each other less and less, living each day in miscommunication... Especially Tsukishima seems uneasy whether Shiraishi, who she hasn't been able to meet recently, truly likes her. Therefore, this time the Vivian's plan to confirm Shiraishi Sora's love for Tsukishima with a 'Private Prank'. Will Shiraishi, in fact, cheat on Tsukishima secretly!? And there is an unbelievable 'behind the scenes' to this plan!?