Together with my beloved sister-in-law, Komatsu Anzu MOND-270

Due to work commitments, the younger brother is temporarily staying at his older brother's house in Tokyo. From that day on, he's been longing for... no, he's already fallen for his older sister... The younger brother just wants to be different from his taciturn older brother, someone he can talk to freely... One day, his older sister invites him for drinks, but...