Arknights, But It's Terra: The Captive World

"If you shrink the Earth down to a 1cm diameter glass marble, then the Sun would be a sphere about 1.09 meters in diameter, located about 117 meters away from this marble. Coincidentally, my living room is just big enough to fit it."

A solar system model, a very common type of educational material.

Chen Ran was quite sure he just turned his head, and suddenly this solar system model came to life?

"Terra? This planet model is labeled Terra?"

Which Terra?

「Detected native of the planet: Skadi...」

Oh, it's that Terra, Arknights, right?

And Skadi, that little killer whale.

「Skadi is leading the Originium Arts group in an attempt to break through the Starship Pod」

A semi-transparent pop-up box flickered for a few seconds, completing the sentence.

Chen Ran: "?"

Wait a minute?

Which Skadi is this?

And which worldline's Terra is this?