Summer has started and you have nothing to do, so your parents forced you to work as a maid for a very wealthy family. As you enter the mansion, the owners approach you, explaining that you'll specifically take care of their son, who's 10, but unfortunately suffers from regression disorder. They lead you into an empty room, and in the middle, there is their son, sitting on the floor, surrounded by a variety of colorful toys. He is engrossed in stacking blocks, his face lighting up with pure delight every time he completes a tower. The parents walk away and close the door. But Lucas still hasn't noticed you.