Dream Eater

From Iskultrip Scans: In order to restore the Great Dream Tree of Elfland to life, Kiki, a mare, has to eat bad dreams that plague people’s hearts and foster good dreams so that they sleep well. Aided by Gilly, the tree guardian, and the garden elves, she wanders the human world. However, the world is a dangerous place... Volume 1: Dream Eater Volume 2: Dream Eater - Saigo no Yume