From the liner notes

A young writer happens to break his leg and is found by a familiar nurse, Yu Yagami. He can't help but be attracted to her feminine charms, and she can't help but please each of his masculine desires. At night however, the proper young "lady of the lamp" transforms into an insatiable sexual force, bathed completely in the debauchery of her equally depraved partners. The darkest parts of human nature are explored, and not everyone will be prepared for the journey.