The dark brown-haired girl and the light brown-haired girl are Hitori no Fan 1-gou/Hitori's Fan No. 1 and Hitori no Fan 2-gou/Hitori's Fan No. 2 respectively. I don't know if they have tags on Danbooru yet or if they're in any other images on Danbooru, though.

EDIT: Thank you to the person who added the tags. :)