Her father, Masanori Yukine, was a violinist.
Her mother, Sonnet M. Yukine, was a vocalist.
As part of a non-government volunteer organization the two parents took a very young Chris with them to a republic that recently suffered from a coup and had suspended all diplomatic relations with other countries: the Val Verde Commonwealth. They entered the country through Guatemala and put on public music performances in different places while traveling with the ultimate goal of lending aid to refugees.
At first, they traveled along with delegates from the United Nations but eventually got trapped by the expanding front-lines of the ongoing war and became isolated from their organization. They were later declared missing.
Shortly after that, Masanori and Sonnet's deaths were confirmed by outside sources, and after some time Chris made her return to Japan while being used by Fine.
Generally speaking, Chris had grown up in a situation where her relations with other people were incredibly confined. Even when compared to Shirabe and Kirika, who grew up isolated in the FIS’s White Orphanage, and especially when compared to girls of her same age. Due to this, Chris has developed what would best be considered a type of “fear” when it comes to relations with other people. She has an inclination to be incredibly cautious when around others.
When she met with Hibiki and the others, they extended their hands out to her and she considers her bonds with them to be very precious. However at the same time, when she reaches her own hand out to others she finds it very awkward and that fact casts a shadow on her heart.
With the arrival of new students and new gear users younger than her, Chris found herself anguishing over a perceived need to fill the role of “senpai.” As she worried over this she would ask herself the same questions over and over in the hopes of coming up with an answer. However the answer was not to be found inside of her, and she came to realize that thanks to her younger peers who she had inadvertently ignored.
Chris came to understand that being able to accept other people is a way of forming bonds with them. At that moment, she lost the conditioned “fear” she had of making relationships and the wall that isolated her from the rest of the world came tumbling down.
And at the same time, she finally understood the feelings of her parents who wished for world peace through their songs.