Marika, the married teacher who left her husband Yuuto for a job transfer, continues her forced sexual relationship with her student Yuuki. The next day, the apartment building manager Torao blackmails her with a photo of her kissing Yuuki and spends the entire day using her body for sex in her apartment. Yuuki, worried about her absence from work, goes to check on her and finds her being fucked by Torao, while her husband Yuuto begins to suspect something is wrong with his wife