Basically, the story distinctly starts with a class of high school-age students getting deployed into a war taking place in a city against these unknown terrorists. The horrors of war are very quickly shown when multiple students are gunned down, with heads and limbs being torn off their bodies gruesomely.
The premise of the story, from what I remember, is that Japan takes kids, trains them in an academy, and sees them fight. One thing: the kids have powers, and they cannot use guns. Apparently this is because Japan isn’t allowed to use guns in wars or something; I can’t remember the plot very well. So basically, you see these kids trying their best to fight a war without using guns, and it results in a lot of death and bloodshed.
A few more scenes I remember: the kids regroup on a rooftop and the most popular kid gets his brains blown out by a sniper. An asshole prototype jock gets his nuts completely blown off, and that’s one of the things I remember well. Also one of the main character’s right-hand men is this dude who’s really apathetic and sadistic, with a radio/communication type ability. Any ideas?