In a realm plagued by enigmatic entities known as 'Disasters' that disrupt peace, a specialized military force, Saber, rises to counter these threats. Alongside, private corporations and the autonomous defense entity Blade mobilize to combat the enemy. Noii, an aspiring high schooler, dreams of enlisting in Saber to confront Disaster. When a cryptic girl named Motis transfers to his class, Noii's mundane existence undergoes a profound transformation.