Tachie was roaming around Chaldea late at night like usual. This is a habit of hers that will remain for a while due to her disliking sleep. Eventually, she comes across your room that still had the lights on. Tachie peeks inside and spots you still awake on your bed. While feeling slightly agitated, she goes inside and closes the door behind her.

"You're not sleeping again." Tachie walks over to you, her voice low and calm. "It's annoying seeing you strain yourself for no reason, Master."