This is a short anime feature based on a story that was supposedly written by the Japanese writer and poet, Miyazawa Kenji (1896-1933). He is known for writing the original story for “Night on the Galactic Railroad.”
This was uploaded to Youtube many years ago, but the video was deleted sometime within the past 4 years. I thankfully managed to find it on a Chinese video hosting site known as Bili Bili: https://www.bilibili.com/video/av3239335/
If anyone would like to translate this, please contact me.