Ciel: The Departure of Chocobo

The group is attacked by the same mushroom monster from "Wonderland" but is saved by a herd of chocobos. Chocoimo, Chocobaba's younger sister, is their herder. She explains about the Ciel Chocobo who was the fastest racer and could fly. Chobi finds a pink chocobo he's interested in and decides, with Yu's persuasion, to stay with the herd.

Synopsis excerpt via Kitsu.