Shikoku (1999)

When Hinako was only a child she was separated from her two best friends, Fumiya and Sayori, as she moved to Tokyo. Now, many years later, Hinako has returned to the small village of Shikoku to meet her childhood friends, but it turns out that Sayori drowned many years ago. When Hinako starts seeing Sayori in her dreams and such, she seeks help from Fumiya, thinking that Sayori wants to hurt her.