Fate/Grand Order: Observer on Timeless Temple

Part 1 of Fate/Grand Order, consisting of nine main story chapters. In the near future, the Chaldea Security Organization is tasked with saving humanity from an extinction-level event called the "Incineration of Humanity." As the last Master of humanity, the protagonist and their Servant, Mash Kyrielight, are sent back to seven distorted points in time called Singularities in order to retrieve the Holy Grails sustaining these anomalies and investigate why humanity is being targeted.