In the Book
In the Movie
During the 160th (last) loop, Kiriya and Rita stay in her quarters near the coast in a sky tower the night (sleeping apart) prior to the battle. The Mimics attack early; and attack the sky tower shortly after they get up to make coffee. They get into their jackets fighting Mimics together and destroy the server and backups until suddenly Rita attacks Kiriya. She tells him that she has become an antenna which is why the loops have not stopped after they killed the server and antenna Mimics during the last battle. Kiriya is able to defeat Rita due to his experience watching her fight; stopping his loops.
Cage loses the ability to loop after being captured by the military and given a blood transfusion. Cage escapes with Rita and is able to find the Omega Mimic and kill it.