Freya was the first Chobit (and the older twin of Elda), who was created before Elda by Ichiro Mihara. Freya was created to be Hibiya's daughter, because she was unable to bear children of her own. She lived happily with the Mihara couple for a time until Hibiya noticed that her attitude was becoming increasingly melancholy. Hibiya asked her husband to build a little sister for Freya in an attempt to make her happy again; from this request, Elda was created. Freya was happy to have a little sister, and for a time, seemed to be acting normally.
Some time after, Freya suddenly lost consciousness and collapsed to the ground. It was only then that Hibiya finally realized the source of Freya's sadness; she had fallen in love with her own father, Mihara. Freya knew that her father still loved his wife, and did not want to disturb their happiness, so she pained her heart with efforts to suppress her feelings. Over time, her pain became so great that she began to malfunction under the strain of her emotional burden. Freya was no longer able to move, and was bedridden from that point on.
In the anime, Freya never found the courage to tell her father how she truly felt; in the manga, she resigns herself to the fact that because of the damage to her body, all hope is lost regardless of the outcome. After reaching this decision, she chose to tell him of her true feelings. Eventually Freya's pain became so unbearable that she chose to self-terminate, rather than continue to exist. Before this could happen, Elda offered to take Freya's heart into her own so that she would not disappear completely, and so that her memories would be preserved. Now that Elda has become Chi, Freya does everything she can to ensure that Chi will find the person just for her. Freya comforts Chi when she is in distress, guides her to understand her feelings for Hideki, and intervenes when she is in danger.