Japanese title: スカイ・クロラ ("Sky Crawler")
Official English title: The Sky Crawlers
A novel series written by Mori Hiroshi, illustrated by Tsuruta Kenji. The character designs for the animated film adaptation are by Nishio Tetsuya.
(Names in the novel & game are written with a kind of old orthography. E.g. "Yuuhichi", "Nahofumi" and "Tohochika")