Houkago, 2-C no Kyoushitsu de.

It's the third in Araragi's yandere trap series after Hatsukoi Lovers and Onii-chan Complex. In it, Yuuto Sasaki is a trap who forces his homeroom teacher Sasaki Tsukimori to spend some quality time after school, which usually entails Sasaki playing a domineering role over Tsukimori.