All You Need Is Kill by Hiroshi Sakurazaka

Anything that moves is an enemy. So don't move, just die!; There's one thing worse than dying. It's coming back to do it again and again...; Beware the Bitch of War!; Defeat in death. Victory in rebirth.

When the alien Mimics invade, Keiji Kiriya is just one of many recruits shoved into a suit of battle armor called a Jacket and sent out to kill. Keiji dies on the battlefield, only to be reborn each morning to fight and die again and again. On his 158th iteration, he gets a message from a mysterious ally—the female soldier known as the Full Metal Bitch. Is she the key to Keiji's escape or his final death?

When the alien Mimics invade, Keiji Kiriya is just one of many recruits shoved into a suit of battle armor called a Jacket and sent out to kill. Keiji dies on the battlefield, only to be reborn each morning to fight and die again and again. On his 158th iteration, he gets a message from a mysterious ally—the female soldier known as the Full Metal Bitch. Is she the key to Keiji's escape or his final death?

Now a major motion picture starring Tom Cruise!