Kamen Rider Ryuki
In "Kamen Rider Zi-O"s "Rider Time: Kamen Rider Ryuki" side story, Goro is being drafted into a new Rider War and feigns having no memory of the previous Rider War while posing as Takeshi's servant until an opportunity to kill him presents itself. Goro gets his chance, but dies inflicting the death wound on Takeshi.