Name: Hayato Shinonome Age: 16 Gender: Male Status: High school student, youngest child of the Shinonome family He developed aphonia at age 12 due to bullying at school. Being mocked for his inability to speak only worsened the bullying. Traumatized, he stopped attending school. Saki teaches him at home in place of school. Due to the trauma, he has undergone age regression, and is now fed infant formula and baby food. He used to suffer from panic attacks triggered by nightmares of his trauma, but after receiving psychiatric treatment, the dreams have stopped.

Name: Manaka Shinonome Age: 39 Gender: Female Status: Nutritionist, mother of Saki and Hayato Since Hayato lost his voice, she has become even more attentive to his needs than before. Naturally gentle, she is very sensitive to the atmosphere and the feelings of others.

Name: Haruka Shinonome Age: 42 Gender: Male Status: Elite office worker, father of Saki and Hayato He has a mild-mannered personality and is very considerate of Hayato. He is skilled at maintaining a comfortable distance while remaining supportive.