"Your scepticism does you credit, I suppose."

He raises an eyebrow. A child, from Japan, from well over a century in his future, knows who Holmes is. That's... a lot to take in.

"But yes. I am Dr. John H. Watson, late of her Majesty's army, friend, colleague, and biographer of one Sherlock Holmes, and until I arrived here I would have told you it was 1892. Good heavens." Watson shakes his head in mild disbelief.