In the not-to-distant future, an extremely lethal, contagious virus called the MK (Man-Killer) virus has emerged & kills off 99% of the world's male population, but the females are unaffected.

Approximately one million males were put into cryostasis before being infected & thus survived the MK Outbreak. The world reorganized under the UW (United Women) government, & they have put in place a breeding program to repopulate the world. 1 male would be taken from cryostatus & would have to impregnate as many women as possible.

You are one of these men.

You awaken from cryostatus & are instructed to stay at an all-girl boarding school called Keimon Private High School. This school was converted into a facility for the breeding program by the UW, while the girls attending there still resume their studies.

Your mission is to mate & impregnate as many of the girls as you can. However, you cannot leave the grounds of the school, due to the MK Virus still being very present in the atmosphere. Also, the grounds have a highly powerful electric fence surrounding the entire school. No-one can leave without special permission.

Keimon High contains classrooms, dormitories, a swimming pool, a nurses office & a P.E room.