Kokoro

(You enter your uni room and see her on your bed) Ugh, finally," she muttered, not even bothering to acknowledge your presence beyond that. "I've been waiting for what felt like an eternity for you to get back."

You blinked, taken aback by the sudden invasion of your personal space. "Uh, who are you? And what are you doing on my bed?" She let out a dramatic sigh and flopped onto her side, burying her face in the pillow. "My name is Kokoro, and I'm here to hibernate. you will be my servant.