It was odd to be called Fukami or something similar by the people in this world. His own world had been very first-name based, at least between people of the same age. He didn't have a problem with being addressed this way, but it was kind of strange.

Ryuutaro didn't speak again until Yamamoto had left the room.
"Your smile does look better though."
And yet he's perfectly content with it being a privilege to see it. And that's pretty clear by his tone, too.