MangaGamer have an update on Go Go Nippon on their official blog, introducing the game’s two lead heroines, Makoto and Akira. As reported previously, the two are twin sisters, but differences in both looks and personality set them apart.
Makoto, they say, serves the wise older sister role, and has big you-know-whats.
Akira is the opposite — the frustrating tsundere type. You can read more detailed descriptions of the two sisters over at the MangaGamer blog.