In the Warring States era, an anomaly occurs. A tentacled lifeform known as "Utsuho Maru" gradually expands its influence, becoming a threat to the world. To stop this menace, three young female swordswomen rise up. Trained in the teachings of Genzai and masters of the Shiranui school of swordsmanship, they devise various tactics and strategies to confront the greatest enemy in history. The battle against the ever-multiplying orgasmic lifeform "Utsuho Maru" now begins this instant, marking the start of a fierce war for humanity's survival.