Mature actress Saki Takeuchi plays a lactating aunt (Ryoko) who lives with her nephew in the same house. She is a single aunt who cooks for her nephew and takes care of him, but also leads a secret relationship with a married man. One day a stranger visits Saki and threatens to tell the wife of the married man about the relationship and ends up pleasuring Saki. When the nephew returns home at night, she finds a distraught aunt and comforts her which ends up in the bedroom.