No series has ever got me so frustrated and involved in the story like the show!!!
First of all, I found out about this show from the book and the forums where people were trying hard to somehow live ideas or advice for the authors. Why you may ask? It's because this story is real, it's based on a book that is an autobiographical book. The author is the main character and even to this day, she does not show her face at book signings or fan meetings (she always wears a mask- you can see her on youtube).

This series actually shows the horrible experience a couple had to go through because of society (there are a lot of silent "whys?", that the viewers can think about). As this happens in Japan a place where mental health/ trauma is not considered real/a problem and where women talking about sex are not accepted. It portrays a true filling of being helpless when needing help.
The pressure and frustration, are easily imaginable because the problems don't get fixed in big part because of the location, this is as real as it gets.
This is not a simple TV show this is a very intimate journal.
The story is unique as I never heard of any other case quite like this one. The pain is real.

The cast is good and the chemistry works, the story is accurate, they kept the series faithful to the book.

My advice is don't look at this project as a simple TV show looks at is as a confession of a friend in need, because the story already happened and it can't be changed. The viewer this time becomes a witness for this couple's hard/painful times.
I even want to read the book so I am searching for the official Eng translation for some time now (years).