They're the voice actress of the four heroines of TV anime "Hidamari Sketch (ひだまりスケッチ)". Asumi Kana (阿澄佳奈) = ゆの; Mizuhashi Kaori (水橋かおり) = みやこ; Shintani Ryoko (新谷良子) = さえ; Goto Yuko (後藤邑子) = Hiro Read more on Last.fm