Strap yourself into a fully-customisable Arsenal and prepare for explosive, all-guns-blazing assault.   When the moon fell from the sky and rained destruction on the world below, mankind forged a network of powerful machinery, controlled by a sophisticated artificial intelligence, in order to help rebuild all that was lost. But now, the spread of an energy called Femto has corrupted these once-subservient machines into a dangerous and merciless enemy known as Arms of Immortal, and humanity finds itself in a desperate battle for survival…