The search results I found were almost all about Nigeria, so what follows comes from general knowledge about Niger rather than sources. Please check specifics before using it formally.
Sexual Assault in Niger
Sexual assault is a serious and under-discussed problem in Niger, as it is in much of the Sahel. Rape and other sexual violence are criminal offenses under national law, but few survivors ever see justice. Stigma, family pressure to stay silent, fear of retaliation, and limited trust in police and courts keep most cases unreported.
Several factors raise the risk. Niger has one of the world's highest rates of child marriage, which exposes many girls to sexual violence within marriage. Conflict and displacement in regions such as Tillabéri and Diffa have left many women and girls living in unsafe, overcrowded conditions with little protection. Poverty, limited schooling, and gaps in medical and legal services make it harder for survivors to get help.
Change starts with community-level work: teaching that responsibility lies with the perpetrator, engaging religious and traditional leaders, keeping girls in school, and building survivor-centered medical, psychological, and legal services.