A spin-off featurette focusing on the character of Ryoma Sengoku (Kamen Rider Duke), released alongside Knuckle as part of the second double set of Kamen Rider Gaim Gaiden, a series of V-Cinema (direct-to-video) releases that each serve as a spin-off hosted by a supporting Kamen Rider from Kamen Rider Gaim.
《幪面超人Duke》
戰極凌馬為了項目而持續研究腰帶，卻因吳島貴虎以拯救人類作首要考慮，比起性能更需要優先處理生產成本為前提下而開始感到厭煩。
某天世界樹財團內部發生定鎖種子自殺式爆炸事件，並查探出是邪教組織「黑之菩提樹」的所為，甚至與本已認定為身亡的前任研究部門負責人狗道供界有關。
