So since I got pretty interested in Utawarerumono: Itsuwari no Kamen, I did some research on the games that the anime adopted from. Then I checked out and completed watching the first Utawarerumono (2006 anime). However the original didn't give me the Spice and Wolf series vibe and the ending was just saddening. It was more into the war/political genre aside from a lot of action unlike in the other series so far. Anyway, this series overall was pretty cool (until the end) and there were some connections I noticed between the original and Utawarerumono: Itsuwari no Kamen.
The protagonist in Utawarerumono: Itsuwari no Kamen was named after the protagonist of Utawarerumono which made a lot of sense into me now. Also could Itsuwari no Kamen's protagonist be connected to the hero in the original? Other than that, there are other possible connections like between the original series protagonist's mask and the other series general's mask (introduced in episode 3). Now I can't wait to see more possible connections for Utawarerumono: Itsuwari no Kamen and you should probably watch the original series to fully understand some references (if you haven't yet). Overall, an interesting war adventure series.
Conclusion: An interesting war adventure anime series.
Note: I unfortunately don't have time to do an actual review or a full impression for this series like other most old anime. I may do so later in the future.