Primary

• Kousei Ichihara Friend of Haruto Kirishima
• Kousei Ichihara Friend of Takashi Yura

Extended

• Takashi Yura Childhood friend of Akari Kaga
• Takashi Yura Childhood friend of Haruto Kirishima
• Takashi Yura Friend of Kousei Ichihara
• Takashi Yura Friend of Yuzuki Eba
• Haruto Kirishima Husband of Yuzuki Eba
• Haruto Kirishima Childhood friend of Takashi Yura