Tenshi no Ashiato

If, just once more, I could see them again.

A place where animals arrive after their lives in this world have ended, before they're reborn. There, all alone, waiting for something, is a former cat named Chiharu. Every animal that comes through is allowed to visit the living world for just one day, and Chiharu walks alongside them toward a mysterious water surface.

A story of animals in heaven going to see the ones they love, before they're born again.

(Source: Kadokawa, translated)