Fate/Grand Order -mortalis:stella- Volume 4

The second singularity is back in the Roman Empire, where a ruler that should be dead is back to life and challenging Nero Claudius, the fifth emperor. Mash and Ritsuka lend Nero their assistance, but before the battle can begin, Caligula-Nero's uncle and the third emperor-stands in their way! The stage is set for a new Grand Order in ancient Rome!