There was a mysterious woman named Nanako who always wore black clothes, had been in mourning for her ex-husband for a long time, and had been widowed four times... She frequently changed her address and lured the next man in while still in her mourning clothes, tied him up with hemp rope, and had him sexually train her as he wished. The man was fascinated by Nanako's voluptuous body, and made a vow to marry her in order to completely dominate her... However, this woman was a ferocious female spider who would seduce any man who approached her, marry him, and satisfy her masochistic tendencies to the fullest, then she would use her poisonous fangs to kill him and devour all his inheritance.