The synopsis can be found here:
Animenfo wrote:The main character Maehara Keiichi moved to Hinamizawa Village. It is a small village whose population is less than 2,000. It was supposed to be under water because of the construction of a dam. But the villagers cooperate together to stop the project. At first, Keiichi is spending peaceful school days with his new friends. However, his life is changed dramatically by a murder case occurred in June. Furthermore, he learns that similar murders have occurred on the same day of June since 4 years ago.
The official website can be found here. You can also check out the teaser trailer here as well. Staff and cast credits can be found here.