The story focuses on the background of Mash Kyrielight and Romani Archaman, and the events leading up to the Seventh Singularity, Absolute Demonic Front Babylonia.
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This episode aired on August 3, 2019 at Fate/Grand Order Fes. 2019: Chaldea Park. It was available for download on the Fate/Grand Order mobile app, from August 4, 2019 to August 11, 2019.

Episode 0 - Initium Iter

Episode 1 - Absolute Demonic Front: Babylonia

Episode 2 - Fortress City: Uruk

Episode 3 - The King and His People

Episode 4 - Welcome to the Jungle

Episode 5 - Gilgamesh's Journey

Episode 6 - The Tablet of Destinies

Episode 7 - Diversionary Operation

Episode 8 - The Mother of Demonic Beasts

Episode 9 - Good Morning, Goddess of Venus

Episode 10 - Hello, Goddess of the Sun

Episode 11 - Temple of the Sun

Episode 12 - Death of the King

Episode 13 - Goodbye, Goddess of the Underworld

Episode 14 - Decisive Battle

Episode 15 - The New Humanity

Episode 16 - Awakening

Episode 17 - The Congress Dances

Episode 18 - Star of the Beginning, We Look Up at the Sky

Episode 19 - Absolute Demonic Front Mesopotamia I

Episode 20 - Absolute Demonic Front Mesopotamia II

Episode 21 - Grand Order

CloverWorks

Aniplex

DELiGHTWORKS

Notes

Fate/Grand Order Absolute Demonic Front: Babylonia - Initium Iter