Age: 15-17
Birthday: December 31
Height: 158 cm
Weight: 44 kg
Blood type: O
Motto: One good deed per day.

Sawako is a shy yet honest girl who is in search of friendship, but her resemblance to horror film character Sadako, Sawako's modesty, and her tendency to shy away from correcting people of misconceptions prevent her from doing so to the point most of the school believed her name was in fact Sadako. Thanks to Kazehaya's kind and open nature, she is able to gradually open up to her classmates, and talk to different people.

With help from Kazehaya, Yano, and Yoshida she gradually begins to make friends. She is grateful (and at first, worships) Kazehaya for giving her the opportunities to make close friends, which came to include Yano, Yoshida, Kazehaya, and Ryu. Yano and Yoshida admit that Sawako's "like" towards Kazehaya might be even more than Yano and Yoshida themselves.

She is rather short, in part because her father is as well and is surprisingly fast, which is revealed during a soccer match at the school's sports festival. During Yano and Yoshida's first visit to Sawako's house, Yoshida notes that Sawako's lips and figure looks like her mother's and most of Sawako's other features resemble her father's. A running gag is that she seems to take what people say seriously as well as over-analyze a situation, which tends to scare the people around her when she is deep in thought.