Kato Keisuke is a Japanese actor and entertainer. He is best known for his roles as Ivory in TV Tokyo's "Happy Boys" drama 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 is from the Box Corporation talent agency. Also, he is one of PureBOYS, though, on March 21, 2008, he announced his graduation from the group alongside colleagues Takiguchi Yukihiro and Nakayama Masei. 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. Kato Keisuke was a student of wakou-shi 2 high school and currently studying in a college. (Source: Wikipedia) Watch drama online for free.