Hijiri-kun wa Kiyoku Ikitai

Hijiri Tsuchimikado is a man playing the role of the perfect student council president, with his good looks and excellent grades in both school and sports. After school, he witnesses his usually quiet female classmate Mitsuki Sado, tormenting their teacher Tamura in a very sadistic way! The perfect student council president gets caught up in Sado-san's secret fetish!
(Source: Kodansha, translated)