Yoichi and his friends board the gourmet train Royal Alex at the invitation of Sanshiro Tawara. As they head from Sapporo to Ueno, Robo Chef, one of the Seven Chefs, appears. Under orders from Taste Shogun, Robo Chef challenges Yoichi and Tawara's cooking machine, Alex No. 2, to a full-course meal challenge in order to conquer the gourmet train.
陽一たちは俵三四郎に招かれグルメ列車・ロイヤルアレックス号に乗車。札幌から上野に向かうその車中に七包丁の1人・ロボコックが現れ、列車攻略のため陽一と俵の料理マシーン「アレックス2号」に勝負を挑む。