ItaKiss

Having missed the entrance exams for Tokyo University, Naoki decides to go with the school's escalator system. After the graduation ceremony, the F and A classes bump into each other during their farewell dinners. An exchange of heated words soon ensues when Naoki puts Kotoko down in front of everyone triggering her to show Irie's childhood photo of him dressed as a girl to the others and Irie drags her out into a dark alley. While in a heated argument, Kotoko says she will forget about Irie and he replies by saying just try then he kisses her and after the kiss he sticks his tongue out and says 'Serves you right' and departs. (Source: Wikipedia)