Saki is one of Yuuki's classmates and the first girl to talk to her. She talks to him because she is curious about his "incident" with Aya-sensei. Saki is quite shameless because she doesn't hesitate to immediately call people by their first names and to give them nicknames. Apparently, she tries since the beginning of the year to make Miyabi, her best friend, enter her "band of friends" because she is pretty and she could attract boys with said beauty. The majority of her boys friends do not really see her as a girl but as a super friend with whom they can talk about pretty much anything. As a result, Saki is more of a matchmaker who helps her friends find lovers. In order to respect the rules of the school and avoid expulsion, she sometimes went on a date with her friend Narumi. She now prefers to have Yuuki as partner but continues seeing Narumi sometimes in private. She has a small collection of adult magazines and videos, to satisfy her needs, which she sometimes shares with Miyabi. She comes from a noble family from her mother side but because her grandfather didn't want her mother and father - who came from a poor family - to get married, they fled away to create their own family. Her mother spends her days in the hospital due to her health, and Saki is quite anxious because her condition isn't getting any better. Due to this, Saki wants to move and be transferred to a school closer to the hospital.