It is the period of the 500 year war: the Era of Warring States in China. Kingdom is the story of a young boy who wants to become General.
The show has a great story, and from the second season the animation is fire.
The Manga is almost as popular as one piece.
If the first seasons animation doesn’t feel right you can read the manga on stream and then when you get to where the season 2 starts, just watch anime from there. I will say when i watched the show I have no problem with season 1. Mainly because it still tells a great story.
from season 1.
https://1.bp.blogspot.com/-_4LbFpGmhfA/YKEyxoVfbXI/AAAAAAAAIOQ/trzHT6s75xgHtPTQBmCJGdJwjnj08lvcwCLcBGAsYHQ/w1200-h630-p-k-no-nu/Kingdom.jpg
From season 2.
https://static.wikia.nocookie.net/kingdom-anime/images/0/0b/Kingdom_2.jpg/revision/latest?cb=20150602001903
The picture shown in the recommendation is from season 3.
https://anilist.co/manga/46765/Kingdom/
https://anilist.co/anime/12031/Kingdom/
