S1·E70 The Last Day of President (episode)

Sasuke is selected to be the new president of student council replacing Sōjirō. For his goal of making Kaimei High a better school, he becomes strict about everything that deviated from school rules. But in the end Sōjirō has to tell him that there are more important things than rules. Three days later, Sasuke officially replaces Sōjirō. In his speech, he says he will make Kaimei High a better school with everyone's co-operation, this gets a big applause.