トリプルブッキング Triple Booking Is Japanese Group-Unit Of Female Seiyuu Voice Actors Formed 2010. This Is A Group Which Was Made On Idea Of Characters From The Author Ujie Tozen Mangaka Work ''Idol No Akahon'' And Later Anime ''Seitokai Yakuindomo'' Imaginary Characters Are Shino Aria And Suzu. Group Consisting Of Voice Actors 日笠陽子 Hikasa Youko 佐藤聡美 Satou Satomi And 矢作紗友里 Yahagi Sayuri .