Primary

• Minoru Tatsuishi Father of Kouji Tatsuishi
• Minoru Tatsuishi Father of Kazushi Tatsuishi

Extended

• Kouji Tatsuishi Childhood friend of Miyo Saimori
• Kouji Tatsuishi Younger brother of Kazushi Tatsuishi
• Kouji Tatsuishi Son of Minoru Tatsuishi
• Kouji Tatsuishi Engaged to Kaya Saimori
• Kazushi Tatsuishi Son of Minoru Tatsuishi
• Kazushi Tatsuishi Older brother of Kouji Tatsuishi