An unnatural incident occurs at a hot spring inn. Suddenly, countless tentacles appear and begin writhing throughout the building. The beautiful proprietress, maids, and female guests are surrounded by these tentacles, drawn rapidly into pleasure amid oozing fluids and the pungent scent of female arousal. Extra-thick tentacles emerge mysteriously from every corner of the inn—Japanese-style rooms, hallways, open-air baths—teasing the women's bodies and transforming their fear into ecstasy. Their cries for help go unheard, leaving them to scream endlessly. The violent movements of the tentacles and the overwhelming desire pressing against the women's bodies drive everything swiftly toward a climax.