Primary

• Ryohei Shimura Friend of Musashi Gouda
• Ryohei Shimura Friend of Hiroshi Kumagawa
• Ryohei Shimura Friend of Tenga Onigawara
• Ryohei Shimura Friend of Shigeo Kageyama

Extended

• Shigeo Kageyama Older Brother of Ritsu Kageyama
• Shigeo Kageyama Friend of Tenga Onigawara
• Shigeo Kageyama Friend of Teruki Hanazawa
• Hiroshi Kumagawa Friend of Musashi Gouda
• Hiroshi Kumagawa Friend of Tenga Onigawara
• Hiroshi Kumagawa Friend of Shigeo Kageyama