I am curious about the details of Kiara's situation/magic. Is she an ordinary witch who simply lucked into contracting with a firebird? Is she spirit-kin, with a relative (or maybe herself) as her familiar? I suppose we'll find out in a subsequent chapter! The difference between the chapters is itself intriguing. We may not know exactly what makes a shinigami different from other psychopomps, but Calli's origin and motivation are made pretty explicit. Kiara's motivation is pretty easy to infer, but since much of her chapter is from external PoVs with limited knowledge, that lack of information gets passed on to us.