In order to take entrance exams for a university in Tokyo, I decided to stay at my older brother's couple's house. My sister-in-law Yuuki is very kind and very beautiful. ALEDDIN's work "The best brother-in-law" that makes you think about the closest brother-in-law. I welcomed "Yuki Seto" as my sister-in-law, and I had a good time with my longing sister-in-law. While delivering it from the perspective of a younger brother who is passionately staring at his sister-in-law, it is full of delusions of an uncontrollable boy. Sister-in-law is a really good thing!