S1·E7 Teasing Kiss

Having missed the entrance exams for Tokyo University, Naoki decides to go with the school's escalator system. Graduation day's rolled round and soon after that, the F and A classes bump into each other during their farewell dinners. An exchange of heated words soon ensues where Naoki puts Kotoko down in front of everyone, upsetting her greatly and forcing her to do something drastic - which in turn yields an unexpected outcome.