Primary

• Mai Minakami Friend of Mio Naganohara
• Mai Minakami Friend of Yuuko Aioi
• Mai Minakami Friend of Nano Shinonome
• Mai Minakami Friend of Professor

Extended

• Professor Creator of Nano Shinonome
• Professor Owner of Sakamoto
• Mio Naganohara In love with Koujirou Sasahara
• Mio Naganohara Friend of Yuuko Aioi
• Mio Naganohara Friend of Mai Minakami
• Mio Naganohara Sister of Yoshino Naganohara
• Nano Shinonome Creation of Professor
• Yuuko Aioi Friend of Mio Naganohara
• Yuuko Aioi Friend of Mai Minakami
• Yuuko Aioi Friend of Nano Shinonome
• Yuuko Aioi Friend of Professor