The Ninja Knight is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Ninjas, known for their exceptional physical abilities, mastery of various tools, and expertise in stealth operations. Knights, who pledge loyalty to their lords, excel in advanced swordsmanship, and are skilled in combat. When these two seemingly incompatible entities intersect, a new story begins.