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.
(spoiler hidden)