Isekai Pomeranian to Niji no Mofumofu Tabi

Synopsis

Kiriko has been transmigrated to another world, where the sky is constantly filled with rainbows and where she has the appearance of a 9-year-old girl. The divine beast that rescues her somehow looks a lot like Potechi (potato chips), her late pet Pomeranian...!? So starts a beast master's fluffy healing journey. (Source: Shogakukan, translated)