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Shizune Arima is Soichiro's Aunt and adopted Mother. She and her husband Shouji were childhood friends. Shouji's father was Shizune's doctor for she was quite sickly as a child. Her father, an artist, often painted her outdoor scenes because she was too weak to leave her room. As the two grew up, Shizune fell in love with Shouji and the couple were happily married. Unfortunately, Shizune was unable to bear children. They adopted the young Soichiro not long after his biological mother, Ryoko, abandoned him. She never got along with her brother-in-law, Reiji. Shizune is aware that the reason Reiji doesn't like her is because of his jealousy towards her marriage to his older brother, Shouji. She eventually saves Soichiro from Ryoko's wrath, slapping her for her treatment towards him as a child. She has an unnamed mother and older brother who are never seen within the story.