It is really interesting to me seeing how the "Romans" (I don't know what to call them. "Imperials?") are adjusting to their position at the bottom of an asymmetric conflict. Unlike our own fights in the Middle East, there are no suppliers of kinda modern weapons to the Romans. But they have adjusted somewhat by adopting guerilla tactics, camouflage, and more use of giant beasts and tamers.
Their minds are not easy to understand, because they aren't even thinking like an Enlightenment-era European. Their system had been very successful at raiding other worlds, bringing slaves and treasure back to the Empire without establishing client states on the other side (the Gate, I think, has been operational for an unprecedented length of time now). I don't know how much of a population the Empire can sustain while using premodern agriculture, for instance. I'd think that they might be getting to the end of their human resources, with the slaughter that comes with each encounter with the JSDF. For such an Empire, a few crop failures due to the shortage of labor might cause it to collapse. The bulk of soldiers might normally have expected to fight during the post-harvest season, and then return to their farms to plant. But now they are in a sustained war with a country that is somehow disconnected from the seasons. Japan's ability to preserve large amounts of food, import food using money, and buy from other latitudes whose seasons are at other times of the year can make them seem like they are being sustained by manna from heaven.
If the Japanese Emperor could be received by Empress Pina with suitable awesome splendor, and then name her his cousin, or something, that might lend enough political legitimacy to help stabilize the Empire around her rule. Naruhito would have to dust off the old lacquered armor and giant spear, since his tailored suits will not convey the right image. Heh, seeing the Prime Minister and the Cabinet all in pre-Meiji costume would be quite a show! They could arrive in gilt palanquins like characters in an opera, all wearing scowling red masks. Black-clad Ninja would be appearing seemingly out of nowhere throughout the proceedings, symbolizing the long and mysterious reach of the Emperor whose merest gesture could bring death at their silent hands.
I'm liking the scene more and more!