Radio Station of Aurora

Miyu, who was doing a live radio broadcast from under the sea, said, "Listeners to the broadcast, I have just discovered a strange little machine-like object at the bottom of the sea."
When she turned on the device, the ice expanded and formed a large ring. Penguin children playing in the ice circle. The children's play was also broadcast live, but their number was decreasing before they knew it ...?
A mysterious radio broadcast in the shining aurora borealis of the Antarctic Ocean. Why don't you listen to it too?