Maryoku Yummy is set in a whimsical world known as Nozomu. It is populated by the Yummy, and small creatures called wishes, the latter from children which are sent here and become granted by Wish Sitters. A trio of Wish Sitters, Maryoku, Ooka and Fij Fij, assists their wishes to become true. So far the only wish not granted, but lives in Nozomu with the Yummy, is a yellow and blue wish by the name of Fudan, who can talk unlike the other wishes.