Amenomurakumonotsurugi Susano-o
Never forget, never will I forget those who were lost,
That sorrow, that pain,
It is the sword of Amenomurakumo that bears wounds and decays
The sorrow, and the pain, of those who were lost,
Were such unendurable
“Oni (demon)” is not a monstrous creature of another world,
But a raging spirit. "Oni" is me.
Because it is the sword engraved with sadness,
Here I offer up it to the heaven with the prayer:
May the sword become the foundation of a peaceful world
Severing the chain of hatred, striking down the darkness of the heart,
With the requiem prayer, it shall become a sacred sword
Susanoo is one of 3 gods who are said to be the most sacred and the last born of Izanagi with Amaterasu and Tsukuyomi, and he is the only one sent out to rule the earth while the other two stay as gods in heaven. A theory says that the gods in heaven signify people who tried to rule Japan as a sovereign nation, the gods on earth mean local warlords, and Susanoo owed the hard, steady job: to pacify and subjugate various regions by fighting and appeasement.
The most famous episode of Susanoo is his slaying Yamata no Orochi, a monster with eight heads and tails, and presenting the sword Ame-no-Murakumo-no-Tsurugi emerged from one of the tails to Amaterasu, which later became one of the regalia of the Japanese emperor.
This story may imply that the sword was created by the local people and was confiscated as a symbol of pacification. Just as the sword was considered the samurai's soul, the local people may have used all their skill and dedication to crafting the sword and treasured it as much as their soul. Perhaps it was precisely because Susanoo had fought day and night for so long, shedding blood and bearing so much resentment, that he accepted the sword along with its soul, and offered it as a mediator between the two opposing parties, as a way to put an end to the fighting.