If you’ve seen the film, “Edge of Tomorrow” you need to read the book on which it is based. All You Need Is Kill is set in Japan, the main character is a Japanese man named Keiji Kiriya while Rita Vrataski is still an American special forces, The Full Metal Bitch.
There are a few differences between film and book but the same basic idea is there which I’ll refrain from talking about just in case you’ve never heard of or seen “Edge of Tomorrow”. The ending is completely different however and I’m not happy with it. Suddenly everything changed with only a one line explanation. If you don’t care about spoilers here’s a discussion about it. The book is also a little short, around 200 pages. The author could have used a few extra pages to build up to why the ending had to happen that way.