Arknights, but all characters are NPCs?

[Day 24: I, Lu Shang, male, [-] years old, am a time traveler.]
【Good news, I have traveled to the Ark of Tomorrow. 】
[Bad news, everyone except me is just an NPC. ]
[Everyone just repeats the same sentence mechanically, and does the same thing every day. ]
I suspect they are playing me.
【So I went to find Kal'tsit, who knew everything. 】
[The next day: Kal'tsit is very moist. ]
[Confirmed, they are indeed NPCs, not playing me. ]
So what should we do next?
[Am I the only living person in the world? Will I die alone?]
[Day 4: The Angel of Power unexpectedly looks slim in her clothes. ]
[Day 5: Xinteleya is really flat. ]
[Day 6: Lu Shang, oh Lu Shang, how could you be so depraved. ]
[Day 7: Skadi warms people’s hearts. ]
【... ...】
[Day 30: Wait, Kal'tsit seems to be alive? ]