Kayo, a married woman whose husband's company went bankrupt, begins working at a convenience store run by her uncle, Ohshima, to support her family. However, the store struggles as a large chain opens nearby. When Ohshima discovers that Kayo still produces breast milk, he devises a plan to save the business: a special "homemade milk" promotion. The unique flavor ignites primal instincts in male customers, drawing endless crowds. Overwhelmed by its success, Ohshima samples the milk himself—and quickly becomes addicted, losing control as he hungrily suckles at Kayo's nipples. This story unfolds from an ordinary situation into an unexpected, erotically charged drama wrapped in mysterious allure.