
Saikoroshi-hen is an epilogue of Matsuribayashi-hen which takes place two months later, in August 1983. Rika is run over by a truck and wakes up in a totally different world, where none of the tragic events of the main series ever happened: Keiichi is not in Hinamizawa, Rena's parents did not divorce, the dam project was resolved smoothly, Satoshi did not run away, and neither Satoko nor Rika's parents died. However the club never formed, meaning Rika has no friends, she gets bullied by Satoko, Hanyū is absent, Rika is not revered as the reincarnation of Oyashiro and the village will soon be submerged underwater. Rika has to choose between staying in that world or killing her own mother, which will enable her to leave that sinless world.
Higurashi no Naku Koro ni Rei: Saikoroshi-hen is a Japanese novel of 79,967 characters, with 4,704 unique words and 1,452 different kanji. Its difficulty rating on Jiten is average, 2.7 out of 5. The full vocabulary list ranks all 4,704 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.