Masayuki was injured in a motorcycle accident, so his parents went on a trip and left him behind. During that time, his brother Kazuo and his sister-in-law Risa came to the house to look after him. However, when Kazuo went on a business trip and Masayuki was left alone with the beautiful Risa, he was unable to masturbate due to his injury, and his sexual desire for Risa grew stronger. In front of Masayuki, Risa hung out the laundry without underwear and cleaned the bathtub in a wet, see-through outfit. Risa's actions, which seemed like temptation, reached the limit of Masayuki's patience...