S.D. Codified Laws § 56-1-3
Current with legislation signed by the governor on or before 3/6/2024
Where a guaranty is entered into at the same time with the original obligation or with the acceptance of the latter by the guarantee and forms, with that obligation, a part of the consideration to him, no other consideration need exist. In all other cases there must be a consideration distinct from that of the original obligation.
SDCL 56-1-3