Oshiego ni Kyouhaku Sareru no wa Hanzai desu ka?

Tenjin is a 27-year-old teacher at a cram school who has no love for children and simply goes through the motions of his job. He trains his colleague JD while being tossed about by the cruel currents of life. One day, while teaching a fifth-grade class, a student hugs him and confesses her love.

A 14-year-old middle school student named Seika witnesses the entire scene. She blackmails Tenjin into giving her "personal lessons" at night, forcing him into a dangerous situation that blurs the lines between teacher and student.