"Queen of Ariake" was a title given to Kashima (Kancolle) back at the 2015 Comiket because of how popular she was in it. Fast-forward 11 years later, Kei achieved the same popularity at Comiket and that's why some call her the second "Queen of Ariake."
@Reia_76 Looking at Yostar's track record, it seems to be a matter of time. A lot of developers took back the publishing rights from Yostar later down the line or stopped working with them on their next games. If you're new to the scene it's probably better to have them as your publisher.