Isekai Tensei Soudouki

Bard Cornelius is the son of a noble from the empire of Mauricia, which exists in a parallel universe. He is unique in that his body contains three distinct souls in addition to his own. These include Oka Sanai, a thrifty samurai, and Masaharu Oka, a high school student who enjoys animal ears. Using his combined knowledge of military strategy and business skills, Bard aims to gain an advantage and rise to power.