The Kind Demon

Foo lives together with his grandmother, but doesn't have any friends. One day, Foo gets lost in the mountains trying to find herbs for medicine. He meets Smoochy, a demon, who helps him. Smoochy doesn't have any friends either! They get along well and become each other's first-ever friends, and play together all the time. But Foo suddenly stops coming to the mountain... Source: MediBang