Arknights: Kal'tsit's Brother Escapes from Prison

On Terra, the remains of a former civilization are activated by the Doctor's operation to review the progress of various projects. Oldham, a next-generation android codenamed AMa-09, awakens from a long hibernation.

However, his father was asleep, his mother was missing, and his sister Kal'tsit was nowhere to be found wandering in this unfamiliar land.

But Oldham, a man-made man with his own ideas, decided to take advantage of his father's sleep to share his worries. He would check on the progress of various plans and revise those that weren't going smoothly. His purpose was to ensure the better survival of humanity, and now was the time to fulfill that duty!

Terra's darkest era officially began the moment he woke up.