Ms. Hibiya secretly leaves Chi the fourth book in the "A City With No People" series. Hideki meets with Shinbo and shares his feelings for Chi. Ms. Hibiya reveals to Hideki that her husband was the one to create Chi and the other mysterious girl, Freya. She tells Hideki that Chi used to be called Elda and, like her sister, was created to be loved and fall in love with others. Chi then tells Hideki that she loves him.