Kayoko Everhart was born in Tokyo (Japan). She studied from 1993 to 2000 at the Washington Contemporary Ballet under Kay Englert's directorship and took summer courses in the Pacific Northwest Ballet and the San Francisco Ballet School. In 2000 she entered the San Francisco Ballet School and in 2002 transferred to the Tulsa Ballet Theatre, directed by Marcello Angelini. Two years later, in September, 2004, she joined the Compañía Nacional de Danza. In 2012 she was promoted as Principal Dancer under the artistic direction of José Carlos Martínez.
Since joining CND she has danced principal roles in the Jardín Infinito, Cobalto, Gnawa and Alone for a second, de Nacho Duato, Carmen (the role of Carmen), by Johan Inger, Romeo y Juliet (Juliet role), by Goyo Montero, Herman Schmerman, In the Middle Somewhat Elevated and Artifact II, by William Forsythe, Sleepless, by Jirí Kylián. She as also danced in other ballets by prestigious choreogaphers such as Mats Ek, Ohad Naharin or Tony Fabre among others.