After the battle with the Hard Smashes, a man appears, holding an identical Sclash Driver! He calls himself Kamen Rider Grease and acts on behalf of Hokuto. His mission is to recover Touto’s Full Bottles in order to allow Hokuto to harness the power of Pandora’s Box! However, Sento and Banjou refuse to roll over that easily and fight back, with Sento tapping the power of the stolen Hokuto Full Bottles!
北都からの刺客、猿渡一海が握りしめていたのはスクラッシュドライバーだった。スクラッシュドライバーは戦兎が開発したもので、北都には存在するはずがない。なぜ一海が持っているのか！？ そんな疑問に応える間もなく、一海は仮面ライダーグリスへと変身を遂げた！！
Um novo confrontante na Guerra Rider aparece atrás de Sento e Ryuga, de alguma forma empunhando seu próprio cinto Rider. Surge Grease, o Rider de Hokuto.
