Yuu Setoguchi

Known for his composed and "cool" demeanor, this easygoing student effortlessly bonds with all his peers. While he rarely loses his temper, his subtle emotions occasionally surface, especially regarding his childhood friend, Natsuki. Though he maintains a mature, nurturing presence due to his history with friends like Kotaro and Hina, he harbors a possessive streak. He keeps a watchful, suspicious eye on Natsuki's potential suitors, hoping she chooses her own romantic path without outside influence.