Atlas and her brother Fouru were slaves owned by Zeltbull's Slave Merchant. When Naofumi was there he purchased them and in order to make Fouru more obedient and obtain a high class slave for cheap he used the Medicine of Miracles in an attempt to cure Atlas of her hereditary illness. She refers to Naofumi as the owner of the gentle voice because she cannot see to which Fouru becomes somewhat jealous