"…Irregularity: none. Resuming combat action." λ-11, the girl who assaulted Ragna the 'Grim Reaper'. He meets with the 'prime field' girl, but she invites Ragna to an even harsher battle. Meanwhile, Noel was hurrying to meet her best friend Makoto Nanaya. But before her, her other best friend Tsubaki Yayoi appears. Toward Noel who is glad with the meeting, Tsubaki——. Continuum Shift. It is all the possibilities of the world. The result of many destinies and infinitely equal endings is waiting for Ragna and the others. Now, the decisive battle that shakes the world begins!!