Sadayo Kawakami

Kawakami is a youthful-looking woman of medium height and a slender build. She has dark brown unkempt hair, dark brown eyes and consistently has a somewhat long and sleepy face. While teaching, she wears a yellow long-sleeved shirt striped with white and red horizontal lines, a blue denim skirt and white kitten heel pumps. During her off-time, she wears a beige blazer over her outfit. During her second job, she wears a French-styled maid costume and has her hair pulled into twin tails. If she's the protagonist's date during the Hawaii trip, she wears a blue and yellow striped bikini, a white graphic t-shirt with a red flower design, and the number 14 on it, and yellow and white flip-flops. Around her neck is a whistle hung on a red strap. While she initially acts very coldly towards the protagonist, this was because she thought he was a problem student and felt unfit to deal with the kind of trouble he could bring. After he stands up to Suguru Kamoshida, she realizes that there is more to him than both his criminal record and the rumors showed and thus becomes more understanding and willing to listen, showing her more compassionate and involved side. This coldness also applies to Ryuji as well, as she warns the protagonist to keep their distance from him and that he is nothing but trouble, though this is followed by her seeming sad at how drastically he changed compared to when he was in the track team.

She is also something of a hopeless romantic, though both her crushing self-loathing and age cause her to feel that she has grown past the point where she can experience such things. Still, she enjoys cheesy romantic lines and is more than willing to throw some herself. She takes being in a relationship seriously, delaying her response when the protagonist confesses to her and refusing at first because of their situation as teacher and student. It is only because it is the protagonist confessing to her and his willingness to be with her that convinces Kawakami to start dating him while also working hard to be a teacher.

Her maid job in Victoria as "Becky" is a housekeeping service focused on providing household chores with a few extra options like sharing a meal with the maid, back massages, and lap pillow. Kawakami effects a stereotypical moe personality, acting energetic, cute and naive. She also acts like a cat and says "meow ♡." As she herself admits, her age and health make this come off as shallow and fake, and she regularly breaks character out of fatigue, at one point, even collapsing on the protagonist's bed and complaining about all the work and odd jobs she has to do.