Shikomi are trainees aspiring to be maiko or apprentice geiko. They are usually 16 years old or junior high school graduate when they start their training in an okiya which lasts for about a year. They do household chores and also attend lessons for dance (mai), singing, shamisen, and other traditional instruments. If they are successful, they will be able to debut as maiko and will be assigned to a geiko who will act as their official onee-san (older sister).
These young ladies are shikomi, probably from the Kawayoshi okiya in Miyagawa-cho. They were very kind to pose for a picture. I am so much rooting for them. Go girls!