Despite mixed feelings on Apollo, I bought this box of limited edition Apollo at a Japanese import shop. Since it's a premium pack, the chocolates are much larger than the normal size and come individually wrapped.
According to the box, this is from Meiji's Hokkaido line, and both the white chocolate and the melon flavor come from Hokkaido. Specifically, this is Furano Melon, or melon from Furano, Hokkaido. Fancy melons are quite the treat in Japan, and it's not uncommon for them to cost hundreds of dollars.
The chocolate smelled like what a melon buttercream frosting might smell, and it tasted like that as well. The flavor, despite containing 4% Furano melon, tasted a little fake to me. It was very interesting, but maybe it just didn't blend with the white chocolate as well as I wanted it to.
The white chocolate was sweet, of course, but could have been a lot sweeter. It was creamy and rich at first, and then the fruity flavor kicked in. My husband thought the quality of the white chocolate was very good, but also wasn't crazy about the melon flavor. I'd still like to try real Furano melon, but for the time being, these provided a cheaper tasting experience.