Except as provided in § 26-11A-21, guardianship or conservatorship of a child under this chapter or chapter 26-8A, 26-8B, or 26-8C shall continue until the court orders otherwise, but not after the child has attained the age of majority except as stated in § 26-7A-100. The child or any person interested in the child may from time to time, upon a proper showing, apply to the court for the appointment of a new guardian or conservator, for the restoration of the child to the custody of the child's parents, if parental rights have not been terminated, or the child's former guardian or custodian, or for the discharge of the guardian or conservator appointed by the court at the final disposition of the child.
SDCL 26-7A-101