Until the morning with her younger sister, who was refugee home from a sudden heavy rain...

The man who lives with her was thinking about getting married. She had a good relationship with her younger sister, Urara. One day, the train stopped due to sudden heavy rain and Urara, who had returned home, came soaking wet. She is also stuck at work and is refugee home, leaving her alone with her step-sister Urara. When Urara was invited in, she was soaked all over her body, and her underwear was visible, and she felt a sexy look that she didn't normally feel, losing her rationality, and she stole Urara's lips...