Looking for kids growing up, becoming teenagers and making friends. But then their parties or countries turn hostile so they all become enemies who kill each other. That type of drama =)

Maybe My Country: The New Age. The bromance between two main characters is insane. They keep hurting and backstabbing each other but at the same time they're also ready to risk their own lives to save each other because of their friendship.

It doesn't really show much of their childhood, but it starts with them being friends.