Alien monsters—whom humans call mimics—mercilessly occupy the planet: they destroy major cities and kill millions of human lives. The armies of all countries joined forces for the decisive showdown with countless hordes of aggressors. New recruit Keiji Kiriya, unprepared and poorly equipped like many of his comrades, is thrown into the thick of the battle—effectively dooming him to death.
However, as he’s dying, Keiji takes the life of the invader with him. And something incredible happens: Kiriya is thrown again right before that hellish day, and by closing the time loop he is now forced to fight and die in that very battle over and over.
But with each return, Keiji becomes more brutal and more skilled, fighting side by side with the famous special-forces fighter Rita Vorataska, who has destroyed more enemies than anyone else on Earth. And each repeated battle brings them closer to unraveling how to defeat the alien invaders and break free from the time captivity.
What awaits them with their mysterious ally—salvation or final death?