I have a one-year visa for Japan. Can I enter Japan with a passport that is less than 6 months valid?

Question:

I heard that as long as I have a visa on my passport (I have a 1-year work visa), I can enter Japan even if my passport is less than 6 months valid. Is this true?

Answer:

You probably shouldn't go there right now. It has something to do with whats on the news.