Mithril is a secret militant organization that quietly eliminates any possibility of conflicts in advance. They send out mercenary Sagara Sousuke to guard Chidori Kaname, a girl with a mysterious and dangerous special power. Sagura is an excellent soldier, but in a peaceful school setting he comes off as a military freak. Kaname rewards Sagara's hard work and protection with blows from a giant paper fan. Yet, being a girl with "Black Technology," a knowledge beyond any human's, Kaname is once again targeted by the minions of evil. Sagara, with his Arm Slave (humanoid weapon) and Teletha Testarossa, with her Tuatha de Danaan (amphibious assault submarine), must fend off terrorists who want to capture Kaname. FULL METAL PANIC, the story loaded with fish out of water comedy and military action and suspense is back!!