After a bit of research - mostly trying to navigate a computer-translated version of Feroumont's detailed Wikipedia page - I believe that The Kingdom series is more typical of Feroumont's work than Gisèle & Bèatrice was, but there's a certain sharp wit and love for antic mischief that I suspect is common in his work. After reading this one, I don't think The Kingdom series is specifically for young readers, but it's all-ages in a European sense: full of things certain American readers (you know the kind) would be shocked to give to their little darlings, but pitched to be understandable to an audience roughly ten and up and reasonable for that audience for most normal human beings.
The full title is The Kingdom, Vol. 1: Anne; it was originally published in 2009, has colors by Feroumont's wife Christelle Coopman, and was translated by Mercedes Claire Gilliom for this 2017 Europe Comics edition. (There are ten books in the series; the six that existed before 2015 were translated in the years of Europe Comics' flourishing and the rest seem to be sitting in limbo for now.)
It's one of those lightly fantasy stories set in a pocket kingdom - small enough to be just the unnamed capital city and as much countryside as needed for stories, small enough that the King can be a local figure, and specifically with no neighbors that impinge on the story. This one, I think, sets up a lot of the characters and situations for later in the series. In particular, this one is about the title character, Anne, the friendly, happy, ultra-competent maid who has been taking care of the King - this isn't the kind of book with a deep sense of the organizational structure of a big house - who loses her job and has to move on.
You see, she's been frightened by owls hooting in the night, and so has been sleeping in the King's bed to avoid them. (He's the usual good-natured-but-ineffectual doddering old guy, along Lord Emsworth lines, so there's no thought or possibility of hanky-panky.) But a flock of little yellow (talking) birds have just arrived in town: this is annoying and disruptive, but not seen as particularly weird or unnatural. They're gossip-mongers - I might say "shit-stirrers," to be more precise - who delight in telling people things that will annoy, anger, or frustrate them, and particularly things that will cause them to fight with each other.
Anyway, the birds told the mean Queen about Anne and the King, so she fired Anne. The King gives Anne an old house down in the city, which she is to turn into a tavern. On the way there, she has some slapstick adventures, attempting to attack the birds and running into the large blacksmith's apprentice François, who immediately falls madly in love with her. (This, I gather, will be a major plot engine for later in the series.)
Anne does find her new home, which is a dump. But the birds more-or-less befriend her - they're still jerks - and help to clean it up. And she does turn it into a tavern. The climax of the story is the opening night of that tavern, when the King's children - two goofy sons and a more sensible daughter - come in disguise to patronize that tavern, plus a large contingent of the palace guards, sent by the Queen to give the impression that the tavern is raucous and unpleasant, so it will fail.
Does the character whose name is in the title of a the first book in a comic adventure series succeed despite all odds? Of course she does.
Feroumont tells this story in a broad way, full of jokes and big body language - it's a funny book that makes very little attempt to be subtle. And it's mostly tween-friendly, assuming your tweens aren't shocked by the "sleeping"-with-the-King plot-starter.












