Completely subjective My sister-in-law is Hatano Yui

I took advantage of the summer vacation to visit my older brother and his wife from the countryside to visit me. After a long time, Yui-san's sister-in-law met is cheerful and kind, and she is so beautiful that it would be a shame for her older brother. But my brother is left alone with Yui and sister-in-law after a sudden business trip...