Sarina, a woman living in public housing, is troubled by her nights with her husband who has little energy and libido. Shinokawa, a middle-aged man who recently moved next door, thinks to recommend her an aphrodisiac made by his pharmaceutical company. A few days later, when he visits Sarina's home, what catches his eye through the open window is her lewd sight of masturbating with sweaty skin and hands roaming over it. The two, who were never supposed to be together, start a steamy affair after this incident…
