The day that the mischievous sister-in-law Kashiwagi came to the playhouse was also the day when the brother-in-law had deep unforgettable memories. Although she is in high school, the most beautiful age of a teenage girl, she is extremely lewd, perhaps this is also the age when the most craving for physiological needs appears. During her days here, she always kept an eye on her brother-in-law, always showing her feelings secretly to him behind her sister's back. Performing sexually arousal, sexy actions along with the slender body of a young woman who is caressing and full of vitality in his youth has made him unable to suppress his desire. This is followed by continuous sexual intercourse behind the back of the wife and sister, which makes the two of them feel happy and happy to do what they want.