(from ebookjapan):
This juvenile fantasy follows the adventures of Comet, a mysterious girl who comes to Earth from the planet Beta. Comet meets Takeshi Kawagoe and his younger brother, Kouji by chance, and ends up working as a live-in maid for the Kawagoe family.
There, she is asked to sleep in the trashy storage room, and with a swing of her magic baton, she turns the room beautiful...?