Souichirou Tatebayashi (舘林 総一郎 Tatebayashi Sōichirō) is the former president of the student council and the boyfriend of Saori Himemiya. Initially, he was shown hating Jin Mitaka, but the novels and anime explains that the two are actually good friends.
Souichirou is initially seen as a cold figure. He clouds his concern for both Jin and Misaki Kamiigusa, which is revealed when Sōichirō asked Jin if it was okay for Jin to study in Osaka and leave Misaki.