Meaning of the billboard?
I recently saw this movie with a friend. His version had pretty shoddy subtitles though, and it didn't translate the text on the billboard next to the police station. Obviously the text is something relevant though, since Sakurai gives it a long, weary look in one scene, and of course the movie ends with a closeup on it.
What was the billboard about, and what's its relevance to the story?
Thanks in advance to anyone who wouldn't mind helping me out on this!