Salina, a housing complex wife who is worried about night life with her husband who has little physical strength and libido. Kishikawa, a middle-aged man who has just moved to the next door, comes up with the idea of recommending a tonic made by the pharmaceutical company he works for. A few days later, when he visited Salina's house and looked into his eyes through the open window, it was her foolery that crawls on her sweaty skin and indulges in masturbation. The two who were never supposed to meet will have a relationship that makes them sweaty after witnessing this masturbation.