小豆長光

The legend of the azuki bean is one of the most charming in the lore of Japanese swords. To split an azuki bean cleanly in two — not crush it, not knock it aside, but divide it as cleanly as a jeweler cuts a gem — requires a blade honed to an almost impossibly acute edge, with steel of perfect hardness and toughness in absolute equilibrium. It is the ultimate test of a swordsmith's and polisher's art combined. Whether the story first attached to the blade before Uesugi Kenshin acquired it, or whether Kenshin himself performed the test, the combination of this legend with his ownership gave the sword an authority that no other proof could match: if the greatest warrior of the age chose this tachi from all the swords available to him, then its sharpness must indeed have been extraordinary. Kenshin fought under the banner of 'gi' — righteousness — and his devotion to Bishamonten, the Buddhist war-god, made him regard his swords as sacred instruments of divine justice rather than mere weapons. A sword sharp enough to divide a bean, carried by a general who never lost a battle: Azuki Nagamitsu is the embodiment of the Uesugi family's martial and spiritual legacy, preserved in Yonezawa in the heart of Tōhoku — the same region where the sword-culture of the north reached its fullest flowering.