"Sure thing." How do I say that in sign language?

From the anime "A Sign of Affection" comes a Nendoroid of Itsuomi Nagi!

Face plates:
· Silent face
· Grinning face
· Surprised face

Optional parts:
· Smartphone


Series: A Sign of Affection
Character: Itsuomi Nagi
Product Type: Nendoroid
Material: pvc
Size: 10 cm = 3.9" tall