I really loved this. It's so tragic what happens to this man who only wanted to help the one he loves. I'm thinking if you had continued with this, and felt the need to end it on a higher note, you could have showed the time device reactivating as it reached an area of time again. He could have gone back then.
Animation was very nice, the thought you put into the story and the small elements that foreshadowed his fate were very well done.