His wife Kaori has a strong libido and wants to have sex every day, but it's hard to do, so she feels lonely. One day, she receives a package she doesn't recognize, and when she opens it, she finds it's an aphrodisiac called "Rum's Balls." She is delighted, thinking that her husband must have bought it for her to use at night, and drinks one or two on the spot, when the delivery man comes back in a hurry, saying that the package is for the neighbors. It's too late. The effects of the aphrodisiac are apparent, and Kaori finds fault and clings to the delivery man's penis...