Multi-Mind Mayhem Volume 4: Isekai Tensei Soudouki

Bard Cornelius is no ordinary nobleman's son. He's got two extra souls packed into his mind: Sanai Oka, a miserly samurai, and Masaharu Oka, a high school otaku who loves animal ears. Bard, who saved the royal family from cholera and received a noble title, visits the neighboring kingdom of Sanjuan on the orders of King Welkin. But what awaits this newly-minted diplomat in Sanjuan is an ugly battle of succession to determine the...