Yuka, a member of the "Horny Sentry" idol group in Mizuryuu Kei Land, is known for her stoic demeanor and perceived lack of passion during sexual performances. However, after a surprising encounter with a fan during a handshake event, Yuka discovers a hidden side of her own desires. Following a private, intimate encounter with the boy, Yuka embraces her lewd instincts and returns to the stage with newfound enthusiasm, delivering an extreme performance that shocks and thrills her audience.