Orcs... hulking beasts from the world of fantasy, large in body with ugly scowls. "Fwaaaaa... good morning!" For Arisa it was an ordinary morning. She and her best friend Chiharu were chatting trivially on the way to school when a nearby TV started broadcasting the news. "...embassy announced earlier regarding leaked documents for what is believed to be a new kind of biological weapon, the Chief Cabinet made the following statement..." It was faraway noise to the girls, having nothing to do with them. They met with Ai and took their seats in class as the bell chimed. It was an ordinary morning. Until they appeared. "Gruraauuhhhhhhgghh!!!" Classmates were slaughtered, trampled, violated. "Aaaaaieeeeee!!! Noooooo!! Hee-eeeeeeeeeelp!!"