The illicit stories between the brother-in-law and the sister-in-law are probably no longer unfamiliar to fans of jav films, and this film is no exception. After many nights of spying and secretly watching the handsome man and the beautiful sister Saejima making love, the desires and lust within the young man also begin to rise. The fire near the straw eventually catches, that is the day when the wife receives news that her husband must go on a business trip far from home for a few days, and of course, this is a perfect opportunity for the young man to do everything he wants, including raping his sister-in-law. Despite the sister's strong resistance, he does not give up his intention and is determined to use his youthful strength to perfectly carry out this perverse act. After that time, the sister seems enchanted, she feels pleasure when making love with him, perhaps due to being fed up with her husband and wanting to find new excitement, she has actively sought him out for a relationship.