That night, Roxana kicked Damian out of her room because she didn't want to be disturbed by the demon's babbling. Besides that, Roxana also wanted to crack the code on the puzzle lock, so she needed a peaceful environment.
She continued to rotate the puzzle lock endlessly, her eyes only focused on the three gears in the wooden box. Occasionally she would glance at her note, then sigh when she realized there were still so many possibilities she hadn't tried.
When her back and neck ached, Roxana lay down on the couch. She was still trying to turn the gears even though her eyes could no longer stay awake.
As clockwise turned to three o'clock in the morning, Roxana couldn't hold her sleepiness anymore and fell asleep on the couch with her hand holding the puzzle lock.
The window in her room slowly opened, and a black cat sneaked into her room. Its footsteps were utterly inaudible, so Roxana could not be aware of the black cat's presence.