I am not a sushi person xD I don't cold fish at all!

Orochimaru's so fucking crazy I doubt anyone's supporting him near Konoha actually. Your idea on a missing child is good, so why not combine some of these. Let's say a rogue ninja is kidnapping children for Orochimaru to use in his experiments. Three birds with one good stone, eh? Of course we could only discover the Orochimaru detail later through dialogue with said rogue, but it would be a good opportunity for Sakura to acquire vital experience. 

O_o ...xD