My wife was going back home to give birth, and her older sister Ayumi was worried about her and decided to come over to help with the housework. I secretly admired Ayumi, who was beautiful, kind, and glamorous. And on this day, when a large typhoon was approaching, Ayumi was also scheduled to come over to help with the housework. Just when I had almost given up on the idea that she would be able to come today, her umbrella broke and Ayumi arrived, drenched. I couldn't take my eyes off her wet hair and her see-through underwear...