Higurashi when they cry. Curse killing arc - Ryukishi07

In this new re-telling, Keiichi, the new boy in the small mountain village of Hinamizawa, learns that his friens Satoko had a brother who disappeared.
She's never fully recovered, so Keiichi is encouraged by fellow club member Rika to take the place of Satoko's brother in her life until her brother gets back.
Keiichi and Satoko's bond gets stronger and stroger as he discovers how smart and resourceful she is but he also learns about Oyashiro-Sama's Curse, which allegedly claimed Satoko's family as its victims......