Context: this is a voice actor joke regarding the new characters from das finale 5.
From left to right, its Shiho, Maho, Koume cosplaying as the new St. Gloriana characters who share the same Voice Actress respectively. (Yumi Touma both voiced Shiho and Uva, Rie Ranaka both voiced Maho and the new radio operator of the Centurion, Eri Sendai both voiced Koume and the new gunner of the Centurion)