Motoki Sae is Misao's teacher. She is also a school classmate and astronomy clubmate of Akira's. She has a powerful punch, which she has used in the past to save Akira from bullies at an arcade.

At school, she tends to behave a little weird, as she is young and inexperienced. She is trying hard to get Kawahara Jou and Misao together as a couple.

In her personal life, her parents are trying to get her married, forcing her to attend an omiai (marriage interview) against her will.