Ore no Ichizu wo Jama Suru Aitsu

Wakaba Koyamauchi, a boy going through a sensitive phase, has a crush on his homeroom teacher. As he tries to act tough to become a man worthy of the older woman, his childhood friend Kai Wakanoi — the girl who sits next to him — starts teasing him about it… Even though he says he has no interest in a childish girl like Kai, will he fall for her naughty temptations!? A romantic comedy about two one-sided crushes blossoming into adolescence! Young man, stay true to your feelings—!! (Source: Ichijin Plus, translated)