This is obvioulsy a more recent item, with the Sonic Adventure 1 type Sonic in dots all over the box.
With such curious packaging (A box which looks like a bag) what sort of food might this be? The writing works out to be Ningyo Yaki (Fried Dolls) Though they are not actually dolls. It is a sponge cake baked into an intricate mould. Traditional designs included masks, birds and temples, but they were always quite detailed. Likely, the cakes in here are actually Sonic shaped! (Which makes them even MORE curious to see!)