The OVA adaptation 15 Bishoujo Hyouryuuki is based on a multimedia franchise also know as The Story of 15 Beautiful Girls Adrift. Unsurprisingly enough, the story is that of 15 beautiful girls stranded on a deserted Pacific island by a storm, and it's a reference to the classic adventure story "Two Years' Vacation" (translated as "Fifteen Boys Adrift" in Japan) by Jules Verne.