I Found a Blue Feather!

Hayato and Hina are close brothers and sisters living in Tokyo. One day, he became interested in the beautiful blue feathers that he found on the road, and came up with the idea of ​​finding an owner. A mysterious crow appears there and travels together as a guide to guide the brother and sister to the owner of the feathers. Is it possible to find an owner of a feather, a brother or sister who searches for an owner through encounters with various birds?