Kato Keisuke is a Japanese actor. He is best known for his roles as Kousuke Kitamura (Ivory) in TV Tokyo's drama Happy Boys and Keisuke Nago/Kamen Rider Ixa in TV Asahi's tokusatsu series Kamen Rider Kiva. He is a huge fan of the Kamen Rider Series, and collects the Battle Ganbaride cards. He was affiliated with the talent agency Box Corporation. Also, he is one of PureBoys, though on March 21, 2008 he announced his graduation from the group alongside colleagues Yukihiro Takiguchi and Masei Nakayama. This graduation was made official on March 31, 2008; the "graduation ceremony" was on March 28, 2008 during the PureBoys' weekly school-themed internet broadcast show. He graduated from Nihon University. In 2016, he launched his apparel brand "StarLean". He retired from the entertainment business on March 31, 2017.