This should never happen with good play, notice that you could have won the game with your last move by playing the 4 helmet on the far left corner, closing off the last rice figure.
EDIT: no, actually you couldn't have closed the rice because the red 3 rice token wasn't there at the moment of your last move.
But now, what should happen now?? I have no idea, I will ask on BGG forum but I doubt I will spend time implementing some kind of solution for such an unlikely case (first time it happens after 4366 Samurai games played here). Probably we'll just have to delete the game.
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