Yutaka Matsuno possesses brown hair and blackish-brown eyes. His typical attire is a high school uniform consisting of a white shirt, red tie, and black trousers. During middle school, he forges a close friendship with Taku Morisaki when they jointly campaign against the cancellation of their school trip due to low test scores. This early collaboration establishes their bond on mutual trust and shared principles. Characterized by a serious and mature demeanor, Yutaka occasionally displays humor that strengthens his friendship with Taku. He maintains a conscientious approach to academic responsibilities and a composed outlook in most situations. Upon meeting transfer student Rikako Muto from Tokyo, Yutaka becomes infatuated. Assigned to show her around the school, he develops feelings and confides in Taku about his attraction. Later, he confesses directly to Rikako but faces a harsh rejection, which deeply affects him despite his outward composure. Yutaka's friendship with Taku strains when Rikako's actions create complications. After Rikako travels to Tokyo with Taku using borrowed money, rumors spread. Yutaka confronts Taku about these developments, revealing his distress over Rikako's rejection and the perceived closeness between Taku and Rikako. Tension peaks during a school festival when Yutaka witnesses Rikako slapping Taku after he comments on her handling of a confrontation. Yutaka reacts by punching Taku to the ground. This act fractures their friendship, leading to a prolonged period without communication. Years after high school, Yutaka attends Kyoto University while Taku studies in Tokyo. They eventually reconnect at a class reunion. During this meeting, Yutaka explains his past actions, revealing he punched Taku because he was upset that Taku suppressed his own feelings for Rikako out of loyalty to their friendship. Yutaka felt Taku sacrificed his potential happiness for Yutaka's sake. Their reconciliation occurs as they watch the ocean waves, symbolizing the restoration of their friendship and mutual understanding.