M3: The Dark Metal

In a shadowy dimension called the Lightless Realm, a group of children form a close bond before being torn apart and sent back to their own world. Years later, they reunite to battle monstrous beings called "Admonitions," which emerge from the same void, piloting giant robots known as "Vess." Despite their efforts, they can only delay the relentless spread of the Lightless Realm as it slowly consumes their world. Their struggle takes a grim turn when a terrifying new enemy appears-a "Corpse," said to wield a deadly song that kills anyone who hears it within nine days. When the group hears the "Corpse Song," each of them begins to unravel, consumed by personal turmoil. As their unity fractures, humanity’s survival hangs in the balance.