The man living with her was considering marriage. He had built a good relationship with her sister, Urara. One day, a sudden downpour stopped the trains, and Urara, unable to return home, arrived soaked to the skin. She too was stranded at work and became unable to return home, leaving her alone with Urara, her future sister-in-law. The invited Urara was drenched from head to toe, her underwear see-through, exuding a charm she usually didn't feel, causing him to lose his reason and seize Urara's lips…
