Zeno had to leave for a mission before Zeuxis got his Nichirin Blade. And hasn't seen his family in quite the while. He sends letters, and messages to his family and Zeuxis who has now too begun the demon hunter lifestyle.
When Zeno is 15, a year after Zeuxis passed the final election and only 2 years left in his clock, he sees Zeuxis's Nichirin blade for the first time.
Zeno is on his way to a mission in the next village when he sees someone familiar. He stops walking and watches the familiar person turn towards him.
He recognizes his little brother instantly and soon he and Zeuxis are talking under a tree. He asks his brother what the blade looks like and his brother grins, like it was the best question of the century, and then proceeds to hand him the sword.
Zeno marvels at the guard and the tsuka. The guard has a beautiful design of a thunder strike fitted in a square. He looks over the black over orange tsuka before turning to admire the sheath.
The sheath itself has a base color of black that has gold shooting off in lightning like shapes from guard downwards decorating it. Zeno then continues to take the sheath off to see the blade itself.
He looks at the practically glowing blade. It's definitely quality, well crafted with care and no flaws visible It's color is a soothing pure light yellow turning into a golden gradient. The whole sword is completed with a few white highlights. So very beautiful Zeno thinks.
His own was still the same, as it hasn't broken yet. The guard of his own sword is plain, just a black circle. The sheath old man Gou had made is still in use, but already damaged. Zeno should ask the old man to make a new one with the same design. The tsuka of Zeno's blade is otherwise the same as Zeuxis's with a base orange color with a black tsuka-ito over it.
He examines it for a long time while trying to ignore the smug grin of his brother. Telling Zeno, just proclaiming, that his was better and more like their fathers.
Zeno does enjoy the feeling of seeing his brother again. And they talk for a while, realizing they have been sent on the same mission.
Even when they separate after fighting the onsen demon Zeno has that warm feeling in his chest.