|Yoshi Touch & Go|
The entire plot is stated in the game's instruction booklet:
"A lone Stork flies hastily through the darkened pre-dawn skies. Held firmly in its beak is a very special package; a pair of newborn twins, which the Stork is hurrying to deliver to their parents!
Just as the Stork races through the skies over Yoshi's Island, something terrible happens! A dark shadow rushes toward the stork with tremendous speed and crashes into it! The startled Stork drops the twin babies..."