Primary

• Kouzou Etou Former teacher of Shinichi Chiaki
• Kouzou Etou Teacher of Megumi Noda

Extended

• 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
• Shinichi Chiaki Love interest of Megumi Noda
• Shinichi Chiaki One & Only Apprentice to Franz von Stresemann
• Shinichi Chiaki Apprentice of Sebastiano Vieira
• Shinichi Chiaki Former boyfriend of Saiko Tagaya
• Shinichi Chiaki Cousin of Toshihiko Miyoshi
• Shinichi Chiaki Son of Seiko Miyoshi
• Shinichi Chiaki Friend of Ryuutarou Mine
• Shinichi Chiaki Friend of Masumi Okuyama
• Shinichi Chiaki Former student of Kouzou Etou
• Shinichi Chiaki Nephew of Takehiko Miyoshi