Jewel thieves become interested in an invisibility formula invented by Professor Nakazato and want to use his invention to acquire a diamond necklace called the "Tears of Amour."
The life, adventures and exploits of warlord Date Masamune the One-eyed Dragon: his early youth as an aggressive warrior, the battles he won until subduing almost all his enemies, the lonely comprehension of knowing that he actually can not take over the whole country because he was born too late.
The plot is based on the novel "Akechi Samanosuke no Koi," the final work in a trilogy by Hiroshi Kato about the forced suicide of Oda Nobunaga at the temple Honnoji. Historically, the general Akechi Mitsuhide is credited with causing Nobunaga's downfall. Kato's novel focuses on Mitsuhide's nephew Samanosuke, who fought alongside his uncle during the assault on Honnoji.
