NA Localization:
They put their swords down. The bloody battle ended without the need to take a single head.
The morning sunlight seems to sting against their fresh wounds. Even if this pain lingers till the ends of time, they will have to endure it. That's the way of life for the men who chose to live in a world full of oni.
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This is a future that could have been. Among the daily battles between oni and warriors, if there was even a single miracle where these two fought side-by-side, they may have spent a morning like this.
But in Proper Human History, the oni of Mt. Ooe were wiped out. Under the protection of the Divine Wine - Shinpen Kidoku, the giant oni's armor made of dragon bones and sacrificial blood pitted itself against the three weapons powerful enough to pierce the heavens, and ultimately cracked...then shattered. Minamoto-no-Raikou and her Four Heavenly Kings severed the heads of each and every one of the sleeping oni, putting an end to their evil.
The sun rises. A new day is about to begin. It may be the dawn of peace for the Heian city, signaling its freedom from the frenzied bloodshed that once drenched its streets. And yet, to the men...
It was just the beginning of an eternal battle as they were made to live with the scars etched deep upon their bodies.
Fan Translation:
They stopped their sword.
They finished the blood battle without taking that head. The morning sun stings their wound awfully.
This pain will continue on for eternity, and they have to bear with it.
Because it is the way of life of men who chose to live in a world where Oni exists—
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This is a future that could have been.
During the days where the warriors were battling Oni, if there was one single miracle of them fighting side by side together, it might have been the day where they greet the morning like this.
However, in Pan-Human history, the Oni has been wiped out from Mount Ōe.
The source of the divine protection brought by the Divine Oni Poison Sake (Shinpen Kidoku Sake)—
The Great Oni's armour, formed by dragon bones and blood of the sacrifices, attacked the heaven, struck against the imposing great suit of armour third ascension form, cracked, and was broken into pieces.
Thanks to Minamoto Yorimitsu's and the Four Heavenly Kings' actions, the drowsing Oni all had their heads taken and perished.
The sun is coming up.
A new day is beginning.
This could be called the beginning of the peaceful days in Heian, where fierce Oni blossoms no longer bloom in madness.
However, to the men—
It was the beginning of days of an eternal battle, where they have to live with the wound within their hearts for most parts of their lives.