Higurashi When They Cry: Curse Killing Arc, Vol. 2 - manga

Keiichi is relieved when Satoko returns to school after an unexplained three-day absence, but the little girl is not her usual cheery self. It seems her uncle has returned, and Satoko is once again at his mercy. Keiichi is furious at his friends' reluctance to step in and help her, but until there's definitive proof of her uncle's abuses, there's nothing they can do. Unwilling to accept inaction, Keiichi plots to end the abuse once and for all. On the night of the Cotton Drifting, blood will be spilled once more...