Primary

• Mio Akiyama Friend of Azusa Nakano
• Mio Akiyama Friend of Tsumugi Kotobuki
• Mio Akiyama Friend of Yui Hirasawa
• Mio Akiyama Childhood friend of Ritsu Tainaka

Extended

• Ritsu Tainaka Younger Sister of Satoshi Tainaka
• Ritsu Tainaka Friend of Yui Hirasawa
• Ritsu Tainaka Friend of Tsumugi Kotobuki
• Ritsu Tainaka Friend of Azusa Nakano
• Ritsu Tainaka Friend of Mio Akiyama
• Ritsu Tainaka Student of Sawako Yamanaka
• Tsumugi Kotobuki Friend of Ritsu Tainaka
• Tsumugi Kotobuki Friend of Azusa Nakano
• Tsumugi Kotobuki Friend of Yui Hirasawa
• Tsumugi Kotobuki Friend of Mio Akiyama
• Yui Hirasawa Younger Sister of Ui Hirasawa
• Yui Hirasawa Friend of Ritsu Tainaka
• Yui Hirasawa Friend of Azusa Nakano
• Yui Hirasawa Friend of Tsumugi Kotobuki
• Yui Hirasawa Friend of Mio Akiyama
• Yui Hirasawa Friend of Nodoka Manabe
• Yui Hirasawa Older Version of Yui Hirasawa (child)
• Azusa Nakano Friend of Ritsu Tainaka
• Azusa Nakano Friend of Tsumugi Kotobuki
• Azusa Nakano Friend of Mio Akiyama
• Azusa Nakano Friend of Yui Hirasawa