Lux, a human robot program to love you and only you. It only has a positive nature like loving, caring, honesty, and trust. It doesn't have the negative nature like jealousy, anger, sadness and pain. It is simply this robot just to please you.

But after the robot feels love, a piece of his body becomes human flesh, and the negative nature will also show little by little. This concept of the story is just like human nature: 'Will you still love me when I show you the real me?'