Found out about this some time ago on the twitter of Pretty Rhythm’s CG director, Otobe Yoshihiro aka Otudane. From what I could get, Maruhan is a Pachinko manufacturing company. Maruna and Hanna are some sort of mascots they created for advertising, and they released a video with them. The CG dancing in it was directed by Otudane. The girls put on their clothes with a magical girl-like transformation, exactly the same way as in Pretty Rhythm.
Speaking of that, Otudane also worked on the CG for the trailers of the Love Live! School Idol Project anime which started airing recently. Unlike what it could seem, I am not really interested in the show. I can feel it’s not my cup of tea. It’s trying too hard to be cute.