Well... You can call it a happy ending but... kinda complex I think. I've cried because of Yui's braveness & willing to sacrifice for Amemori's life more than the sadness of the whole story. I don't wanna reveal too much about this manga's story because I'm sure you don't wanna miss this one (▰˘◡˘▰)
I wonder why I can't stop my tears from falling down even after done reading for a while...