Ikuta, a highschool student, is in able to express his feelings sincerely so, when he tries to confess to a girl in the rooftop he bombs it badly and, by chance, Shizu sensei is there to listen and laugh. That is how sensei falls in love with a dishonest student, who bluntly declares his hatred but can't stop looking at him.
It's really amusing to read how little by little Ikuta ends falling for the teacher and how teacher restraints himself from doing more with him.
Sensei Nante Kirai Desu.