This World of Ours (2007)

Original title: 俺たちの世界

Ryo is a boy broken on an emotional level, doesn't go to school anymore and locks himself inside at home. Hiroki is a student constantly talking about changing the world, but struggles to keep up with his friends. Ami, an isolated girl, comes into the life of both boys. The three of them get alienated from society and slowly, but surely, from each other and themselves.