I do like that Kuru isn't jealous of Nagi in the romantic sense.
Rather, it's feeling threatened by Nagi's usefulness and general skill set. A rather..."masculine" sense of comparison and contention, but it fits with him specifically in a substantive way, as he has no skills, having been a prince and waited on in every conceivable manner in his past.
I also really like that Nagi isn't waving any of this in his face or flaunting their difference in capability. He's genuinely there to help his childhood friend, and he's happily interacting with Kuru and willing to help him purely for the sake of imparting knowledge with no malice or derision toward the Hidden Prince.
The doll serves as a lovely little metaphor for Kuru, as well--and not just because it turned out to be a prince. Pulling himself from the river, using a skill set he's just now starting to develop, is Kuru pulling himself up from the muck of his past failures and shortsightedness; and he did it after accepting the help of Nagi, when before he would have been too proud and conceited to admit he couldn't do something all on his own.
Emma taking such care to clean and mend the doll is touching, as well - given her "you were a prince, too" line, the symbolism isn't lost on her.
I know the 'Romance' tag is placed on this, and there's real potential for something to develop between Emma and Kuru. I actually hope it happens slowly, though, and that it only begins when Kuru has come into his own at the inn and has satisfied the more immediate necessities of developing skills, gaining self-sufficency, and most importantly building his confidence up to the point he can stand on its own.
The fact that there's no overt sentiment in that direction thus far between the two of them is encouraging, in light of that. I look forward to when that shift begins to take place within one/both of them, but I really enjoy this more platonic, earnest effort to "put the prince back together" arc they're endeavoring upon.
Also, I hope the fisherman comes back and becomes semi-regular, though. Him being a barometer of Kuru's progress would be a great touch to the storyline, especially if Kuru makes a habit of regularly returning with fish from off-screen, in the future.
Thanks for the TL work as always.