Mizuki's relationship with her husband has grown cold, and longing to be desired as a woman, she meets a man through a dating site. He dominates her anally, introducing her to unprecedented pleasure. Hesitant at first, she finds herself unable to resist when he orders her to perform anal masturbation over the phone. When the man shows up at her home with his friend, they both toy with her anus. Mizuki becomes addicted to anal pleasure, screaming in ecstasy as she repeatedly orgasms from anal sex.