Yeah, being jailed in your own house forever is gonna get super-mega boring, and maybe drive you a bit insane. Specially without more dynamic media and internet. Of course, being rich with a giant garden helps a lot, a lot, but geez....
Besides that's just a prick thing to do. Let them girls out.
But I'm happy that this manga isn't one of them sadist exploit types, that just shows horrid suffering.
We are kinda of seeing the best-case scenario for some really controlling patriarchal laws and customs (not super different from 19th century Europe honestly). Husbands that are mostly understanding, love and cherish their wifes, etc.
Also.. yeah, I'm getting some saphic vibes here lads and lasses. Which I would imagine was way too common when your only permitable friends were women, and the rest was family.
Funny how this story is very much analogous to Amir's "a birds home is the sky"