Kozue Minami: Rezu Kaikin ~Imouto ni Koishita Watashi~

Original title: 美波こづえ　レズ解禁　～妹に恋した私～

After losing their parents at a young age, Kozue and her younger sister Hina have lived their lives supporting each other. Hina has always adored her kind, caring sister and clung to her, and as she grows up she gradually realizes that her romantic interest lies in women. Kozue, meanwhile, has been unable to move past a painful heartbreak and feels completely fed up with men; she has found herself increasingly drawn to women as well, though she has never had the courage to take that first step.