Primary

• Narue Nanase In love with Kazuto Izuka
• Narue Nanase Sister of Kanaka Nanase

Extended

• Kanaka Nanase Sister of Narue Nanase
• Kazuto Izuka brother of Kazuto's Sister
• Kazuto Izuka In love with Narue Nanase
• Kazuto Izuka Friend of Masaki Maruo