The Piano Forest
ピアノの森 (original)
Amamiya Shu transfers to Moriwaki elementary filled with hope and ambition. But it doesn't take long before he gets picked on by the class bullies, and gets involved in a dare to play the mysterious piano in the forest.
Starring Aya Ueto, Hiroyuki Amano, Mayuko Fukuda, Chizuru Ikewaki, Rica Matsumoto, Ryunosuke Kamiki, Kazuko Kurosawa, Hiroyuki Miyasako, Udo Suzuki, Junji Takada
It's a animation and drama movie, and has a rating of 7.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from United States.