The fact that in the culture of Megumeru, womans need so much the approval of their parents (and it's not the same with guy) is not a bit sexist because they are less free in marriage (and so in their whole life) than mens ?
For example, forced marriage is not objectively bad ? or lack of freedom for women in many countries ? (whether social or societal pressure, if a woman have legaly the right to choose who she will married, it's still bad if she deswoned for it or unable to do it in the real life)
I mean, some countries include the lack of speech freedom as a part of their culture, like the untolerance of some islamic states...
Im sorry what? Sure they can marry anyone they want too, buy they can be disowned in the process. And thats not just Japan, that happens worldwide. Theres nothing legally (Aslong as they are both 18+) stopping two people of opposite genders (Or same sex where thats legal) getting married, even the parents cannot stop that. But annoying the shit out of your parents in Japan by dating someone they dont like is huge. But its not against your human rights for your parents to say "I dont want you to get into a relationship with that person"
Of course that happens elsewhere , but does that mean it is acceptable? there are countries where refuse an arranged marriage is possible dishonorable ... but still acceptable?