Primary

• Ryuutarou Mine Best friend of Masumi Okuyama
• Ryuutarou Mine Best friend of Megumi Noda
• Ryuutarou Mine Boyfriend of Kiyora Miki

Extended

• Masumi Okuyama Best friend of Megumi Noda
• Masumi Okuyama Best friend of Ryuutarou Mine
• Masumi Okuyama In love with Shinichi Chiaki
• Megumi Noda In love with Shinichi Chiaki
• Megumi Noda Student of Kouzou Etou
• Megumi Noda Student of Charles Auclair
• Megumi Noda Best friend of Masumi Okuyama
• Megumi Noda Best friend of Ryuutarou Mine
• Kiyora Miki Girlfriend of Ryuutarou Mine