The Claudius family is one of the rich elite families remaining in the post-apocalyptic world. When she was a child, Rachel was a quiet girl who rarely spoke. This silent behavior and attachment to Leah's dolls angered Leah into pushing Rachel down their house stairs which disabled Rachel spine down and put her in a comatose state. In order to save Rachel's life, the sisters' father Jephthah Claudius used his Fenrir connections to inject P73 Bias Factor into Rachel's body after hearing about Soma's case. This Bias Factor operation regenerated Rachel enough to revive her. She became more talkative after the operation's success, but her body was then similar to an Aragami's.