Isekai Tensei Soudouki is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Balud Cornelius is the son of a noble of the Mauricia kingdom and inside him also dwell the souls of the 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.