泉こなた(平野綾)、柊かがみ(加藤英美里)、柊つかさ(福原香織)、高良みゆき(遠藤綾)

They are the voice actresses for 泉こなた (Izumi Konata), 柊つかさ (Hiiragi Tsukasa), 柊かがみ (Hiiragi Kagami) and 高良みゆき (Takara Miyuki), the main characters of らき☆すた (Lucky☆Star) anime. They sang the opening song for this anime, called 「もってけ！せーらーふく」(Motteke! SE-RA-fuku / Take it! Sailor Uniform) and 「かえして！ニーソックス」 (Kaeshite! NI- SOKKUSU / Give it back! Knee Socks) song that comes with the OP single.