The Thunder God and the Mulberry Tree (1976)

A young boy who has lived without his father for some time buys the tallest eggplant seedling at the market, hoping to grow it into a plant that will bring them lots of fruit. When the plant eventually grows all the way to the clouds, the boy decides to climb up to see what lies beyond, and has the time of his life with the rain-making oni.

Unfortunately the movie The Thunder God and the Mulberry Tree is not yet available on HBO Max.