Gakeppuchi Kizoku no Ikinokori Senryaku

Read Manga Gakeppuchi Kizoku no Ikinokori Senryaku / The Survival Strategy of a Noble on the Brink / 崖っぷち貴族の生き残り戦略

In the other world, wield Earth’s knowledge as your weapon! On Earth, use magic from another world! A grand rise-to-power fantasy where a soul is shared across two worlds!!
Dennis, the second son of an impoverished noble family, one day realizes that he shares his consciousness with Masaya, a middle-aged man from another world (Earth). Though initially bewildered by this bizarre situation, Dennis quickly recognizes that Masaya’s modern knowledge could be the key to restoring his territory’s failing economy.
Determined to save his family and the people of his domain from ruin, Dennis begins taking action using Earth’s knowledge and innovations, while Masaya gains access to magic in his own world…!