Superb Song of the Valkyries: Symphogear

From the Horizon of Mankind's History (5x1)

Air date: Jul 07, 2019

Going off of data retrieved from Tiki's remains, the Symphogear users head to Antarctica, where they are confronted by a powerful automated "coffin" that Adam was investigating. Despite the overwhelming odds, Hibiki and the others manage to destroy the coffin, inside of which they find the corpse of a Custodian.