Introduced in Season 2, Retsuko's mother bears a strong physical resemblance to her daughter but holds opposing views on her life choices. She possesses a domineering nature, frequently criticizing Retsuko's solitary lifestyle and untidy apartment, which becomes a major point of tension between them. Her intrusive advice, however, is motivated by a deep concern for Retsuko's happiness and well-being, a loving intention Retsuko acknowledges despite her frustration. She is married to Retsuko's father, a calm and passive man who trusts his daughter's judgment and avoids excessive interference. The character's real name is not provided.