Simply it's cute about time travelling, It's the same idea of "Orange" the Japanese manga, anime& movie but has a different feeling tho! Maybe you can't change the end but you always have the right to change the details!
any ways this is highly recommended for light comedy, cute moments and some moral lessons indeed. and also.. and .. Lin Austin guys don't miss that!!
A friend told me before that we won't regret something that we faild to achieve, but we will regret not working for it! we just have to fight to live the life we want. (i know and i just wanna that courage)