Fate/Grand Order: Epic of Remnant - Ashutokuiten EX Shinkai Dennou Rakudo SE.RA.PH

The action takes place at an offshore oil platform known as Seraphix, designed to mimic the structure of the Moon's Holy Grail War. It functions as a prison-like environment where escape is only possible for the final survivor. The setting is under a time constraint before it reaches its breaking point and collapses. Within the depths of a concept called "Ego," which seeks to experience dance, something remains hidden. The narrative is based on Chapter 1.5 of the mobile game's "Epic of Remnant" storyline.