Honestly, Mashiro is one of the worst MCs I've seen. She has to see her friends getting raped and murdered in front of her to stop whining and do something useful for a change. She's fucking useless otherwise.
"Missed his head?" Fucking how? You blew up a grenade right in his face, how could that possibly miss? For a manga this edgy, it is seriously bizarre how unwilling it is to kill off characters.