Hoshi no Densetsu Agartha

Remi Tachibana is a girl who adores mysterious phenomena like UFOs - as well as the works of Ishimori-sensei. One day, while she gushes over UFOs to Ishimori, a young man named Shun Kuroki comes in, wishing to become Ishimori's assistant. Remi and Shun take an immediate liking to each other, and Shun gets accepted. However, a series of strange phenomena begin to occur. Shun also appears to be hiding something as well... Soon, Remi will find herself in a bizarre tale straight from the SF manga she loves!
Ishinomori's attempt at an authentic long-form shojo manga, a SF romance set within the lush mountains of Akita.