GEN Manga is Indie Manga from the Tokyo
Underground.

GEN Manga was made to give fans an exclusive look at real doujinshi,
otherwise known as indie manga, that they had heard about, but until now, unable
to get their hands on. In its essence, doujinshi is manga traded among
other manga artists. Manga for manga lovers!

Kitaro must unravel a
mystery between the two cutest girls in school. One claims the other is an
alien! Is Sana Sakuma really a secret visitor from outer space or is this some
elaborate prank? The mystery spirals in and out, back and forth, keeping you
guessing until the very end. Do you want to believe?