The Ancient Magus' Bride: The Boy from the West and the Knight of the Blue Storm.

Gabriel, an ordinary boy who has just moved from London to the countryside, is bored and misses the friends he left behind. He gazed out the window, as if wanting to escape from it all... until something strange caught his attention: mysterious smoke rising from the woods near his house. As he follows it to investigate, his world becomes intertwined with the hidden world of mages.