The homeroom teacher of Class 2-2 at Nanahyakuichi Public Middle School. Sasayabu seemingly cares about the wellbeing of his class and its students, as he tasks Sengoku Nadeko to hopefully help mend the tension from prior swindling. Though his intentions are good and kind hearted, he relies a bit too much on Sengoku.

Spoiler

Due to his heavy relying on Sengoku and constantly asking if there's any development, it leads her to snap at everyone.