Age 16 (Hidamari Sketch-365) 17 (Hoshimittsu-Honeycomb)
Sae is an upperclassman and good friends with Hiro. In the anime version, she has a younger sister, Chika.
Her artistic specialtity is fiction writing; she writes fiction professionally under the pseudonym "Aya Tachibana" and enrolled at the school specifically so she could learn how to illustrate her own work.
Sae, who is tall, athletic, and generally mature, has a playful side that can be at the same time enigmatic and cunning; she has a habit of giving Yuno just enough warning about potential problems for the younger girl to fail to avoid them.
She also has a fondness for playing detective when faced with such anomalies as Miyako's apartment. She tends to get upset when Miyako refers to her as having masculine qualities. She also gets very uncomfortable when asked about her love life, frequently inventing a history for herself that even cursory examination would show to be absurd, while blushing furiously.
Sae is also very shy about her feelings towards her friends and especially her sister. She is much more comfortable chiding and scolding her little sister, Chika, whenever she comes to visit. However when she expresses genuine concern for her sister, her face will turn beet-red.