Nao, married to an employee of Yabuta Development, was recognized as the cornerstone of her family. She is invited by Yuki, the eldest son's wife of the Yabuta family, to appear in the company newsletter, and together with her younger sister Yuka, agrees to an interview. However, the interview turns out to be a trap—immediately after it ends, they are kidnapped. The two are then subjected to intense training to prepare them for a stage performance at a secret club. A disturbing and shocking series of events unfolds.