You're probably right. With some digging, I was able to find to find a list of *some* of the actresses featured in this video:
http://oppai110.blog54.fc2.com/blog-entry-1441.html
櫻井ゆうこ 長澤りか 青山りんか 瀬咲るな 瀬戸ひなた 愛音ゆう 水沢久美
Yuuko Sakurai, Rika Nagasawa, Rinka Aoyama, Runa Sezaki, Hinata Seto, Yuu...