Read Kuro no Senki: Isekai Ten’i Shita Boku ga Saikyou na no wa Bed no Ue dake no You desu Record Of Kurono's War クロの戦記 異世界転移した僕が最強なのはベッドの上だけのようです Record Of Kurono’s War
Kuro no Senki follows the story of Chrono Crawford, a noble from the Cepheus Empire who harbors a hidden past—he was originally from modern-day Japan. Transported to another world, his advanced knowledge of technology and unconventional mindset make him an overpowered figure, fueling his ambition to become the ultimate “Harem King.” When his own empire casts him aside, he is given command of a ragtag group of outcasts, including minotaurs, dwarves, and elves, along with a struggling territory on the brink of collapse. Despite the odds, Chrono leverages his expertise from Earth to rebuild his forces, strengthen his domain, and transform his barren land into a thriving region. With his unique perspective and strategic brilliance, he defies expectations, proving that even the weakest can rise to greatness. (Adapted from NU)
