Anna has short brown hair and blue eyes. She typically dresses in tan shorts, blue sneakers, and a two-shades of blue t-shirt. At the Tanabata festival, she wears a pink yukata that belonged to Setsu Oiwa's daughter.
Anna is clumsy, very polite and very shy - I mean extremly shy. She doesn't have any friends at school. She thinks of herself of minor value, because of her foster mother. Yoriko doesn't have the courage to tell her the truth.
When we first see Anna she is sitting at a bench in a park drawing, after conversing with an art teacher who had to turn their attention to another student who had hurt themselves Anna appears to suffer an attack of sorts as she gasps for air and tightly hugs her art book. Afterwards we learn that Anna suffers from asthma. After conversing with Anna's foster mother Yoriko Sasaki, Doctor Yamashita suggests that Anna take time away from city life and live in the country to help alleviate her symptoms of her asthma.