Manga Isekai Tensei Soudouki

Balud Cornelius is the son of a noble of the Mauricia kingdom and inside him also dwell the souls of the niggardly warring states commander Oka Sadatoshi and animal ear otaku high schooler Oka Masaharu. With these 3 souls in a single body, he can exhibit extraordinary abilities when it comes to combat or managing the domain.