The Frontier Lord Begins with Zero Subjects: Volume 4 by Fuurou

When Dias comes down with a fever, the twins nurse him back to health with a mysterious herb... Could it be that Dias really did receive the legendary sanjivani herb from that weird talking baar? Before he can think too much about it, however, Dias learns from Eldan that he’s officially a duke! The title comes with a whole host of new and complicated responsibilities, but what has Dias most worried is simply deciding on a new family name! Can Dias learn and remember all the new and confusing laws and rules while Iluk Village prepares for the freezing winter ahead?