After a routine day of research aboard the Rhodes Island landship, an experimental attempt to harness Originium energy goes horribly wrong. In a flash of light, the entire ship, along with its Operators and the Doctor, is transported to a foreign world-one filled with ancient heroes, powerful magic, and a looming crisis threatening the very fabric of reality.
The world of Fate/Grand Order has been destabilized by a new Singularity, one that intertwines with the plague of Oripathy from Terra. Now, Rhodes Island must join forces with Chaldea's Master, Ritsuka Fujimaru, and their legendary Servants to battle this unknown threat and restore balance to both their worlds. But as the lines between realities blur, so too do the definitions of friend and foe.
Can the Doctor, Ritsuka, and their allies uncover the truth behind this unprecedented Singularity, or will the infected consume both worlds?