MOND-270 Longed-for brother-in-law and An Komatsu

A younger brother has to stay with his older brother who lives in Tokyo due to work. Ever since the day my brother came to announce his marriage, I've been there... no. My sister-in-law, who I had grown fond of, was also living there...My younger brother, who spoke as little as possible, unlike my older brother, who didn't talk much...One day, my sister-in-law decided to have a drink. I invited him...