S1·E25 Chii Decides

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