[GBF] Dark Rapture (Hard) - Optimus Dark Full Auto (1 button then FA)

Grid and Summons at the end. Although the build is in the GBF Wiki
Nothing else is notable for this run except maybe the Dark-favored Repudiation buff, Kou surviving through post-25% so that Summer Azusa didn't have to switch in and finish the fight and finishing the fight with a Chain Burst: Oblivion Fall, in true GBF fashion.
Other than that, pretty standard fare for a five-year old raid.