That's what it says in fine print on the upper left-hand corner of this package.
On the back, it warns, "Avoid keeping under direct sunray," which goes for hearts, too, I'd say. The mochi are wonderful, if you like your tea in a sweet, gummy, snot-green ball. (Guilty.)
Lesson learned: take photo of contents of package before you eat them.
Tip o' the keyboard to Jeff's post Pink Noodles.