A lot of eating goes on in the new documentary "Gokutomo" ("Friends in Prison"), which is about five men, all convicted of murder, who spent many years in prison. Watching one of them casually buy a sweet bean bun at a convenience store, you realize that, as an indulgence, food can be the most obvious marker of freedom. Locked up for decades for crimes they say they didn't commit, these men appreciate the relative luxury of being able to eat any time they want to.