Jeszcze Polska nie zginęła
Chances are, that for the animated series, a girl based on Stanisław Skalski or other polish ace appears.
The eleven girls from the prelude had a vast axis inbalance and the novel didn't change that.
Why isn't the OVA on /rs/?
On the map I must say, I liked the original map from the OVA, since it showed an interesting alternate history. The worldwide destruction is a bit strange since some parts are completely untouched, which does not make sense due to waterlevels.
As long as the novel is not translated and the animated series is not running, we will not know.
To answer OPs question. The Italians are cowards and the Japanese know it.
Venezia being independent instead of being part of Ostmark is strange though.