Watch The Love Potion for Free: How to Stream the Movie Online at 123Movies. . Nikkatsu Roman Porno, the second entry in the Maruhi Oo'oku Gaiden series. Recieving a mysterious foreign love potion, the Shogun's harem (or Oo'oku) becomes disordered; meanwhile a famous woman attempts to enter and seek revenge in the disguise of a male monk.