This is not a place for review, but i think i am just going to do it here. I've read the WN using google translate so i am just going to base it of that and the snipet shown by raw scanlated part of the manga. basically this is overlord with an actual responsible adult instead of chuunibyou with power. That's pretty much the premise of this manga, the pacing may be all over the place and are definitely inferior to overlord but world building wise it's good enough. Don't expect internal management anywhere after the first volume. it's focused on ester de baronia/valonia (the country) more than the MC itself (though since ester de valonia are centered on him his decision is always important) so after dealing with sudden internal problem due to the transportation, it become sidelined as external problem become more of of the main focus. This one is world domination under the veil of friendship aka usual politic. The MC are a nice guy but know his responsibility as a king (usually soft and prefer to make friend with other country but won't shy out of dominating a country if it would profit the country) .The subordinate themself are similar to overlord 'everything else is just an ant compared to their country and the leader is the best'. It's interesting read, even if it's not a masterpiece but please try it out.