Arisa

Arishia (亜理沙) is a motherless girl who works on the far side of the forest.

Background
Arisa suffers from very slight mental retardation and stayed with Kai Ichinose's piano until the end.

Etymology

 * The name Arisa means "second, Asia" (亜) (a), "reason, logic" (理) (ri) and "sand" (沙) (sa).