Spoiler......
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In the webnovel, years down the line, he DOES actually take her to be his real wife & they have kids together (I'm not sure how many years later, but presumably after she's old enough that having kids would be less dangerous & it was mentioned how Shizuko had set up maternity care & prenatal care centers. She becomes a pretty modern wife & is the first to use Shizuko's tech/medical advances for moms/pregnant women & Mitsuo grows to trust her enough to show her a family photo that he kept on hand when he time travelled.
Webnovel says that Mitsuo as a husband is very gentlemanly & caring compared to a typical Sengoku era husband (ie: PDA like holding hands was not very common back then) & this ends up turning her into kind of a yandere.
yo wtf
Ah... it looks like Shizuko never leaves then, or doesn’t leave after a long time. I wonder if they ever show what the future looks like since she’s basically brought the Sengoku era up to modern speed? I’m not sure how I feel about this old man dating a younger girl even if she does grow old enough to safely have children... but it’s better than a gross pervert, and it is just a manga, so I guess I’ll just dislike that aspect and keep reading
So far, the altered future (if it IS altered) is not shown. WN is going on 10 years of her life in Sengoku period.
I’m glad that even though the old man was forced to marry her, he isn’t going to treat her as a wife. He has his morals intact, thank God.