I thought of that, but can't recall at which school Nishikata was teaching. I've seen a comment on the reddit thread saying that on Moto he's a junior high/middle school teacher too, if this school is exclusively a highschool then it can't be the same.If I remember correctly, Tanabe-sensei and Tsukimoto-sensei both teaching at the same school, which is Nishikata old school. Now considering Nishikata return to his old junior high school to teach as a P.E teacher, doesn't that mean he and Sanae's sister both work in the same place?