Hogwarts: Harry Potter and the Dragonborn

[HP fan + partial settings of A Song of Ice and Fire] As an illegitimate son of the Targaryen family, Arnold's biggest dream is to have a dragon of his own when he comes of age. Unexpectedly, at the age of ten, Arnold was inexplicably bound to a mysterious system; when he opened his eyes again, he came to a very strange world. [System mission release: Ask the host to become the king of the world! Arnold fell into silence as he looked at the steel box in front of him that was running around at an inhuman speed, and the strange wizard riding a broom in the sky who put people to sleep in an instant. The Seven Gods, did they make a mistake in allowing a minor like him to become a king in such a dangerous world?