TEND-012 My cheeky sister-in-law is the class president...Erisa Katsuki

One day, my brother suddenly has a cute sister-in-law due to his parents' remarriage, and he is worried about how to deal with her. Despite her brother's worries, her younger sister, Erisa, keeps prying into his private life. Yes, Erisa is interested in her brother as a man! The older brother has no way of doing anything to Eri, who uses her immature body as a weapon...