"Tell me," Sakaki tilts his head curiously, "What do you know of parallel dimensions?"

As if dealing with Aragami is not enough, Cradle Lieutenant Mashiro and Blood Captain Madoka Nanase were sent on a mission, along with their teammates, to investigate a strange phenomenon. The next thing they know, they're sent to another world whose inhabitants are dealing with their own world crisis which are, instead of flesh-eating cells, are man-eating giants.