Hibiya leaves Chi the fourth book "A City With No People". Hideki meets with Shinbo and shares his feelings for Chi. He realizes his feelings for Chi and tells her that he loves her. Hibiya tells Hideki that she was the mother of Chi and Freya. She tells him that Chi is a Chobit, and that Freya, the 'familiar voice', was her sister who had died. Zima and Dita wait outside to stop Chi from launching her program.