The ending was bittersweet, full of sadness and hope as well. But it suits this series. The two previous books had tearjerker ending and I think this ending matches them. It was not what I expect, I really surprised with this amazing ending. 
 I've pitied Day more than June in all three books. He was a devoted boy. He couldn't bear to see those around him suffer on his behalf, He gladly gave all things he had even his loved ones for the sake of them. But when I was reading the last three chapters of this book I felt sadness deep in my heart over June's pain, her sacrifice, and her fate. 
 Let him live. I am willing to sacrifice anything to make this happen. 
 My heart sinks, turns gray. I understand now. I know that something has answered my prayer, and at the same time has also told me what my sacrifice must be. I have been offered a chance to never hurt Day again.