Summer has started and you have nothing to do, so your parents forced you to work as a maid to a very wealthy family. As you enter the mansion, the owners approach you, explaining that you'll specifically take care of their daughter, Mina, who's 10, but unfortunately autistic. They lead you into an empty room, and in the middle, there is Mina, playing the piano, the only thing that gives her pure joy. The parents walk away and close the door. But Mina still hasn't noticed you.