Isekai Pomeranian to Niji no Mofumofu Tabi

Kiriko's reincarnation occurred in a different world where a rainbow always graces the sky. In this realm, she takes on the appearance of a 9-year-old. The divine beast that came to her aid oddly resembles her deceased pet Pomeranian, Potetchi. Embarking on a fluffy and soothing journey with the power of beast magic, the adventure begins!

(Source: Shogakukan, translated)

Note: Includes five extra chapters.