Tsuki no Kae, who lives peacefully running a cafe with her fiance, attends a reunion and unexpectedly runs into her ex-boyfriend, who she used to be trained as a sex slave by her master. Though she's now married and thought their relationship was over, her body still remembers that stimulation. In front of her classmates, she's suddenly re-trained as a sex slave! Lied to about a second meeting, she's taken to a hotel where her position is made clear with slaps and spankings, leading to brutal sex! Ruthless creampies are delivered without mercy, completely reviving her memories as a sex toy. Now, lukewarm sex just won't do. She's not a wife or a woman anymore, she's a bitch in heat.