My Younger Cousin Who Made Her High School Debut Asserts Her Dominance is a Manga/Manhwa/Manhua in (English/Raw) language, ROMANCE series, english chapters have been translated and you can read them here. You are reading My Younger Cousin Who Made Her High School Debut Asserts Her Dominance chapters on ManhwaZ, fastest updating comic site. The Summary is
I have a younger sister who’s 3 years younger than me. Before, she was just a generic girl, but ever since getting into high school, she’s become a wonderful gal. Going through our everyday life, she would mount me, or so I thought, but there were tears, and believing lies, huh? It’s only her look that’s changed!? Dominating and getting dominated! A pure older brother and a bad and easy going little sister, 1 on 1 love comedy, begins!!