Kamen Rider BusterSupplementary Volume Kamen Rider Saber Manga: Kamen Rider Buster; 別冊 仮面ライダーセイバー 萬画 仮面ライダーバスター

Taking place over 2 decades before the events of Kamen Rider Saber chronicling the high school days of current-era Kamen Rider Buster, Ryo Ogami.