

"Kounai Shasei 1" begins with a text prologue introducing a miraculous Girls' High School that can be reached by sailing across the Indian Ocean or traveling the Silk Road—a school supposedly mentioned by the legendary Marco Polo in his memoirs. This sets the comedic tone for the following narrative, which takes little inspiration from history and instead focuses on attractive high school girls. The game lacks a cohesive story, instead consisting of five separate vignettes—short episodes featuring a seductive high school girl, a male lead (default-named "God"), and a series of humorous and sensual scenarios set in various locations: a school, a haunted house, a busy train station, and more.
| FM Towns | July 26, 1991 |
| PC-9800 Series | July 26, 1991 |
| MSX | September 13, 1991 |
| Sharp X68000 | December 31, 1992 |