As a storm blankets the city at night, the Sakamoto couple had planned a dinner party with Eriko, the wife's coworker. However, due to the typhoon disrupting transportation, the wife is unable to return home from work. Around the same time, Eriko, coincidentally visiting the neighborhood for a sales round, arrives drenched from the rain. The husband, who has secretly harbored feelings for Eriko since before marrying his wife, finds himself unable to suppress his racing heart as they spend time alone together. The rain shows no sign of stopping and only grows heavier, drawing the two closer together amid the sound of falling rain...