Fate/Grand Order -mortalis:stella- 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!