Primary

• 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

Extended

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