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...