"If the Earth were shrunk to the size of a glass marble with a diameter of 1 cm, then the Sun would be about 117 meters away from the marble, a sphere with a diameter of about 1.09 meters. Coincidentally, it fits perfectly in my living room." A solar system model, a very common type of popular science textbook. Chen Ran was sure he had simply turned his head, but how did this solar system model suddenly come alive? "Terra? This planet model says Terra?" Which Terra? "Planet native detected: Skadi..." Oh, this Terra, Arknights, right? And Skadi, the killer whale. "Skadi is leading the Sea Si herd in an attempt to break through the star pod." The translucent bullet box flashed for a few seconds, completing the following paragraph. Chen Ran: "?" Wait a minute? Which Skadi is this? Which world line's Terra is this from?

[Day 1: I, Lu Shang, male, 24 years old, am a time traveler.] [Good news, I've traveled to Arknights.] [Bad news, everyone except me is just an NPC.] [Everyone only mechanically repeats the same sentence, doing the same thing every day.] [I suspect they're playing me.] [So I went to find the all-knowing Kal'tsit.] [Day 2: Kal'tsit is very smooth.] [It's confirmed, they are indeed all NPCs, not playing me.] [So what should I do next?] [Am I the only living person in the world? Will I die alone?] [Day 4: Angelica unexpectedly looks thin in her clothes.] [Day 5: Cintrea is really plain.] [Day 6: Lu Shang, Lu Shang, how could you be so depraved?] [Day 7: Skadi warms people's hearts.] [... ...] [Day 30: Wait, Kal'tsit seems to be alive?]