Primary

• Tomoe Koga Friend of Sakuta Azusagawa
• Tomoe Koga In love with Sakuta Azusagawa

Extended

• Sakuta Azusagawa Older Brother of Kaede Azusagawa
• Sakuta Azusagawa Friend of Nodoka Toyohama
• Sakuta Azusagawa Friend of Rio Futaba
• Sakuta Azusagawa Boyfriend of Mai Sakurajima
• Sakuta Azusagawa Friend of Tomoe Koga
• Sakuta Azusagawa In love with Shouko Makinohara