Characters from the Blue Archive.
A girl in a mysterious tablet device called "Sittem's Box". The original appearance of "A.R.O.N.A", which is the main OS of this device. The Sittem box was left by the federal student council president to the teacher, and everything from its manufacturer, operating system, and system structure was a mystery that could not even be activated by anyone other than the teacher. Speaking in a tone similar to input character reading software, sometimes noise such as sound blurring is sandwiched. When I first met the teacher, I was impressed and a little tempered, and when I saw the fingerprint left on the screen for biometric authentication, I said, "(Hmm ... I may not be able to see it well ......... Well, is this okay?) There is a strange human touch, such as thinking, or saying that fingerprint authentication is automatic and faster with the latest devices. Also, it's said that it's like an alien movie somewhere, and it's crazy. Where did you find out? However, even though the administrator is unknown and it is floating in the air, its performance is very high, such as gaining control of the Sanctum Tower, which is the center of Kivotos, in a short time. Normally, the walls and ceiling collapse, and desks are piled up outside, creating a classroom-like space with a wide blue sky and horizon. You can see it on the job selection screen, sometimes taking a nap or looking out (when you poke Arona, you wake up or notice this and move closer). I have something like an umbrella with something like a stock of rifles, but I don't know what this is. In addition, I often see it because I comment on various things such as gacha production, tutorials, and during battle.