Kuro no Senki: Isekai Teni shita Boku ga Saikyou nano wa Bed no Ue dake no you desu  

Kurono Crawford was a member of the ruling class in the Cepheus Empire who harbored a clandestine secret - he was from modern-day Japan. With his knowledge of advanced weaponry and strong moral compass, he effectively functioned as a "cheat" in his quest for dominance as a harem king. Despite being forsaken by his superiors, he found himself commanding a group of demi-humans such as Minotaurs, Dwarves, and Elves, who were discarded by their own people. As the head of a struggling fiefdom, Kurono worked tirelessly to strengthen his forces and revitalize his land with the aid of his knowledge from another world.