Fate/Grand Order Absolute Demonic Front: Babylonia

2017 AD. Researchers and scholars of both Magecraft and science have been gathered to maintain human civilization under the Chaldea Security Organization. But calculations then proved the extinction of humanity in 2019. The cause is "realms that cannot be observed" that suddenly appeared in various eras of history, called "Singularities." Ritsuka Fujimaru, the one Master remaining in Chaldea, has been intervening within these Singularites, alongside the Demi-Servant Mash Kyrielight. He has been attending to the forbidden rituals to resolve or destroy the Singularities: the "Grand Order."