With his pregnant wife unable to have sex, Yuji cannot shake his frustration and secretly visits a soapland. To his shock, the woman who greets him is his wife's friend Ai. She explains that she entered sex work after her husband's income fell and they struggled with loan payments. Yuji tries to request someone else because of the awkwardness, but Ai serves him with a smile and gives him overwhelming pleasure. His desire for her body proves stronger than his guilt toward his wife, and he soon returns to see her again...