The story is about a boy with magical powers related to growing and reviving plants. One day, another boy appears in his home. The stranger is from another world, where there are no plants because there is not enough water (there's only sand in that world).
After meeting him, the stranger notices the protagonist looks exactly like the prince from his own world, who nobody likes, because he is a bad person. The protagonist and the stranger start living together, while the stranger learns about life on Earth (everything is different from his world).
Then, another guy arrives at the protagonist's house. He is from the same world where everywhere is a desert. Moreover, since the appearance of the two strangers, the protagonist's powers increase, and he is able to give new life to dead plants and trees.
If someone knows the title of this manga, please tell me!