Yumi Morita is Mayu Morita's mother. She frequently imparts advice to her daughter on proper manners and social conduct. These etiquette lessons stem directly from her own experiences confronting her husband about his behavior, specifically his interactions with other women. Her marriage involves addressing her husband's tendency to flirt outside their relationship. This dynamic leads to moments where her usually calm demeanor shifts into a more intimidating presence when angered. Yumi consistently displays a composed yet formidable nature when handling familial conflicts, particularly those involving her husband's actions. Her background and development center entirely on her role within family interactions and passing life lessons to her daughter, with no significant evolution or expanded backstory detailed elsewhere.