Domestic na kanojo is the most philosophical manga and the story is very complex. This refers to the Nietzschean philosophy to "embrace suffering", the author of this manga is a genius, I really need to give highest appreciation to Kei Sasuga, this is masterpiece. I believe not everyone can understand what is meant by the ending and the story here, but I can say this is the only good ending possible to be happen.
The main character here is supposed to be hina, "love is devotion", this is the highest form of love itself, this is the only manga that can describe true love, and pure love.
"You're ready to suffer and death for someone you love, for their happiness"
This quote about hina in the manga is the total goosebump about hina's true love. The highest form of love, pure love, and I suppose this is what Kei Sasuga want the reader to get:
"she just keeps trying to make you happy until the moment when there is nothing left but love"
I can say this is the best romance manga in history, masterpiece, just few people can understand the story behind it, and the implicit meaning it tries to tell. I can give rating 1000 out of 10