So, to the best of my Japanese translating abilities, (which may be quite off - disclaimer!) I have decided that this package says "Sour Peach Soda Candy". It makes the most sense I've found.
Today I tried this candy out over my lunch break. I didn't think much of reading the package and just popped one of the little whitish/tan rectangles into my mouth and started chewing.
Boy, was I surprised. First, there was a kind of powdery, sour sensation and then I was kind of chewing on little gummy ball things (I know, I'm so eloquent). After those went away, I was left with a deliciously peachy tasting gum-like candy. It was really good!