Funny enough, Kiara is the 3rd boss defeated so far after the plot-twist at the end of her guiding Gura and Amelia through the HoloJP server.
I wonder will Moona eventually face off against Death (final boss) and then the Ancient one herself (Super boss).
Seems more like Moona's the boss in these instances. She attacks these girls in diamond armor when they are more or less naked. Heck Amelia and Gura didn't even have any weapons.