Nobunagun

Weapon otaku Ogura Sio is on a school trip to Taiwan when she and her classmates get caught up in an Evolutionary Invasion Object attack, not that she has any idea what is going on. And who is the guy with the knives?

The incident in Taiwan draws to a close, and Sio gets a chance to have a heart-to-heart with recovering Asao before deciding whether she will join the monster-fighting team or not.

Sio starts intensive training at the Dogoo facility with war photographer Robert Capa. She manages to make some friends on base, but the reality of everyone's situation there is harsh.

Ogura and the others are sent to deal with an Evolutionary Invasion Object that can ride a hurricane.

Sio is assigned to the 2nd platoon. When she joins up with them on their airship, she learns that e-gene holders just keep getting weirder. Meanwhile, DOGOO learns something new about the Evolutionary Invaders--and it's not good news.

Gaudi, Cyx, and Geronimo of the First Platoon crash-land on a snowy mountain. By coincidence, they come across a research outpost where something has gone horribly wrong...