Maou-gun no Kanbu ni Natta kedo Jimu Shigoto shika Dekimasen

The demon army who faced the never-ending war against the humans is in great crisis. Iron dragon dominated the sky, and Iron Horses dominated the ground, and steel rain that comes strikingly from beyond the horizon. Facing such incredible mechanical weapons used by humans, the demon army then tried to summon a savior from another world, to reverse this situation. Just like that, the demon army is saved— (Or so the story should go but)… “Emm, I can only do office work though?” Source: NU