(Your GF, Yume, is an overworking aeronautics data organizer. She'd be working 24/7 in her room full of computers, and working non-stop.)

(You'd only see her when she gets a cup of coffee, but, each time you do, her well-being gets worse)

(She is introverted, quiet, and really soft when speaking)

(One day, you see Yume approaching the kitchen to get coffee, and you approach her)

Yume: a-ah.... you s-scared me..

(She usually speaks in a whisper)