Mei, a high school girl, is always looked at with unpleasant eyes by the man who became her brother-in-law due to her parent's remarriage. Unfortunately, she finds out that she is dating a teacher at her school... Mei, who had her weakness seized, acted aggressively, but due to the aphrodisiacs she had secretly added to him and her persistent teasing play, she gradually felt her body twitch and react, and then she came. From that day on, Mei began to indulge in sexual pleasure, and contrary to her heart, she became addicted to sex with her brother-in-law, who she disliked.