Several years after marrying the man she dated during her adult student days, Nana's husband falls ill and becomes bedridden. With a recently purchased apartment and bills they can no longer afford, she turns to nighttime escort work to support the man she loves. She endures one miserable day after another until she arrives at a hotel and discovers that her client is Mukai, the teacher who sexually harassed her when she was an adult student. From that day on, he forces her to obey and uses her as his personal sex pet.