|Family||Citizen Z - Boyfriend|
Koukou - Uncle
|First Appearance||"A New Mission"|
|Series lifespan||"A New Mission" to Present|
Nothing is known about Kaya prior to the apocalypse.
She finds Citizen Z and Pup out in a blizzard, and takes them to her home in order to rescue them.
It is revealed that Kaya is pregnant with Citizen Z's child.