This is a Japanese wargame of the campaigns of Oda Nobunaga in Central Honshu published in the Old Games Journal #49.
A very well regarded game, it is considered one of the best if not the best games that Mr. Tetsuya Nakamura has ever designed.
Second edition published in Game Journal Special #4(Nobunaga's Greatest Crisis).
Nobunaga: A Most Dangerous Time is being reedited as part of the International Games Series with the name of A Most Dangerous Time: Japan in Chaos, 1570-1584.