Ar Ru is one of the greater wills of Ar Ciel. Her true name is Ar Ru. Her first priority is to preserve the life of the planet and she won't hesitate to re-format all life of Ar Ciel. In fact, she's very coy and shy. Along with her complicated personality, her preference in food is also very complex. Ar Ru really enjoys living on Ar Ciel and she dislikes stripping. Ar Ru's Hymn is Ec Tisia, sung together with all the others Wills of the Planet.