Dang, the page 17 spread looks like something that could be a beautiful ending for most isekai stories. But I'm glad this isn't ending here, as married life and pregnancy (plus childcare in the future) are things that aren't shown often in these kinds of stories (in female-oriented isekai it's probably more common I guess), and I'm all for it. Most male-oriented isekai tend to end when the couple gets together, so this is a rare chance to explore these less-depicted story elements.
"If we don't do something about him, we'll never be able to advance further in."
She lacks critical information. The Wolves of Justice are exactly the reason the war has fallen into stalemate for both sides and big advances are no longer possible. She will be facing an enemy stronger than either the demons or humans, or both combined.
I welcome Tia into the cast. The demon side is in need of some modest cuties, for variety from their usual fare of mostly sexy-type ladies. So I guess Yuigarde's own generals are rebelling soon, and the demon side is about to fall into a full-blown civil war, up from just rebellions.