Fuji Shuusuke, referred to as 'Fuji Older Brother' by Guo Yu, is a friend of Tezuka Kunimitsu. He habitually waits at the corner for Kunimitsu to go to school together. He is kind and observant, noticing Guo Yu's presence and engaging with him warmly. He offers to show Guo Yu around the school and holds his hand, knowing Guo Yu likes such gestures. He is surprised that Guo Yu is attending school instead of being homeschooled. He also interacts with Kikumaru and Inui regarding Guo Yu's identity. He is a supportive figure in the tennis club.
