This is about the anime character. For the monster itself, see Skull-Capped.
The Jills tell the Searchers a legend that happened many years ago about a Skull-Capped that lived among them. They were very frightened of him as he was cannibalistic, until the Cinder Bird stopped him. The Cinder Bird sacrificed itself by offering its body to be the demon's meal, but touched by its kindness, the demonic possession left the Skull-Capped and he transformed back into a regular Jill.