This book is generally shelved as "Science Fiction" and "Time Travel," but don't let that fool you. This is a book about feelings
. Yes, there is a time loop, but there is zero scientific explanation for the existence of it. No advance technology. No aliens. Nothing like that. Time repeats, and we don't know why.
I'm not saying it's a bad book. I actually enjoyed quite a lot about it. I think there's something to connect to here for folks who have been in love, had doubts about relationships, or worried about the the future. This story is sometimes touching, sometimes heartbreaking, and is in a lot of ways a study on how life choices can affect the chooser and the world around him.
If you're looking for a lot of action or traditional science fiction type stuff, you'll not find it here. But I did find other things to enjoy.