BF-519 — Completely Subjective My Sister-In-Law Is Yui Hatano

I came to Tokyo from the countryside to visit my brother and his wife during my summer vacation. I met my sister-in-law Yui for the first time in a long time. She is cheerful, kind, and beautiful, and she is too good for my brother. But my brother has to go on a business trip suddenly, and I'm left alone with my sister-in-law Yui.