Baron's Ultimate Transformation (バロン 究極の変身 Baron Kyukyoku no Henshin) is the forty-third episode of Kamen Rider Gaim. This episode marks Kaito's transformation into an Inves, Lord Baron. Mai's relationship with the Woman of the Beginning is also revealed. It also features the final appearance of Mitsuzane Kureshima's Kamen Rider Ryugen Yomi form and Ryoma Sengoku.