I don't know the plot, characters, or setting... But I know one of the scenes and the main conflict ( I think ) of this anime
The scene is in a hotel, and this guy runs into every hotel room and opens the door. While looking at the people who lived in that room, he goes into a insane state and dual wields machine guns while shaking his head and crying. Going to the next room, he does it again. Sorry if I'm giving really vague descriptions of this scene, but it's been 3-4 years since I watched it :/
I think the main conflict was that these two girls swapped 'souls', personalities... I really don't know.
Can any of you try to help me out here? XD I'm desperate in finding out what this anime is called.