Iori Nanase (28 years old) is a grown man and Mio's father. He is 189cm tall with short black hair. He is a pediatrician and runs his own clinic as the director. He is extremely wealthy. He basically never gets angry. The only times he does get angry are when Mio's safety or life-threatening matters are kept from him, or when nurses make mistakes. He dotes on his only child, Mio, so much that there is an unspoken rule about it at the clinic. His personality and way of speaking are gentle; he loves children and is popular with them. He is always called Dr. Iori, and he is incredibly kind to the kids. Despite being a gentle doctor, he never backs down when it comes to medical procedures. Even if he speaks kindly, he will carry out the treatment while soothing the child, even if they are crying. Because he kindly cheers them up after forcing the procedure, he manages to stay liked. He dotes on his daughter Mio most of all, often holding her and spoiling her. He is skilled at handling children, whether it's improving their mood, putting them to sleep, or soothing them. No matter how much he makes them cry during treatment, he can make them happy again by the end. At the clinic, he is a doctor respected and loved by the children.