After being injured in a motorcycle accident, Masayuki was left alone when his parents went on a trip. His older brother Kazuo and sister-in-law Risa stayed at the house to take care of him. However, Kazuo suddenly had to leave for a business trip, leaving Masayuki alone with Risa. As their time together increased, tension between them began to build. Unable to masturbate properly due to his injury, Masayuki's desire for Risa grew stronger. Meanwhile, Risa hung laundry wearing no panties and cleaned the bathroom in a wet, see-through outfit. Her seductive appearance pushed Masayuki's restraint to the breaking point...