Primary

• Risa Koizumi Girlfriend of Atsushi Ootani
• Risa Koizumi Friend of Nobuko Ishihara

Extended

• Atsushi Ootani Boyfriend of Risa Koizumi
• Atsushi Ootani Former boyfriend of Mayu Kanzaki
• Atsushi Ootani Friend of Heikichi Nakao
• Atsushi Ootani Friend of Ryouji Suzuki
• Nobuko Ishihara Girlfriend of Heikichi Nakao
• Nobuko Ishihara Friend of Chiharu Tanaka