One thing I really appreciate about this is that it shows the depressing reality for lesbians, but also women in general, who spent most of their life in the post-war years. Living in a patriarchic society is already hard enough as it is, if you then are also in love with a person of the same gender it becomes only harder still. Of course, with more bravery and determination, these two might have found a way to be together, but the reality is that just a tiny minority of people would have the mental fortitude required to defy social expectations so radically.
And that's precisely why I think this story is great, we are lucky to live in a time where women are a lot freer in their choices and homosexuality is much more accepted (at least in Japan and most Western nations). However, it is important to remember just how difficult things were and to understand why it is so important to fight for and protect this freedom to be yourself. So while this story is sad, its sadness can be channeled into something positive, which I personally think is quite beautiful.