師匠の塩谷（小松利昌）が命を落としたことで自らを責める絆斗（日野友輔）。ショウマ（知念英和）は憔悴する絆斗を見つけると精一杯の言葉をかけ立ち直らせようとする。 そんなショウマと絆斗の前に酸賀（浅沼晋太郎）が現れた。酸賀は絆斗を連れ戻そうと仮面ライダーベイクに変身。ショウマもガヴに変身し立ち向かうが…！
Kizunato (Hino Yusuke) blames himself for the death of his master Shionoya (Komatsu Toshimasa). When Shoma (Chinen Hidekazu) finds the haggard Kizunato, he tries his best to encourage him to get back on his feet. Then, Sanga (Asanuma Shintaro) appears before Shoma and Kizunato. Sanga transforms into Kamen Rider Bake to bring Kizunato back. Shoma also transforms into Gab and confronts him, but...!
