We have the revelation of how the character Boruto got Sasuke's headband that began in chapter 49 of the Boruto manga
For those who follow the saga, Isshiki Otsutsuki attacked the Leaf Village, being forced to abandon Jigen, as well as the human vessel in which he was hiding, revealing his true Otsutsuki form in battle.
This transformation left Isshiki particularly vulnerable; Jigen is an imperfect vessel, and it is only Kawaki who can fully contain Isshiki's essence before burning Jigen's body and causing the Otsutsuki warlord's death.
With the clock ticking, Isshiki rushes to the Hidden Leaf Village and begins slaughtering the villagers to take Kawaki away. As Hokage, Naruto faces Isshiki in a face-to-face battle in the skies above Konohagakure. However, as the "Shadow Hokage," Sasuke has an entirely different plan.
While Naruto is fighting, Sasuke takes Boruto aside for a chat. Sasuke has been paying close attention to the revelations about the Karma Seal and its purpose as the Otsutsuki's resurrection method; he also knows that during Team 7's rescue of Naruto, Boruto's Karma Seal allowed Momoshiki Otsutsuki to unleash a terrifying power.
Boruto borrows Sasuke's headband:
So Sasuke wants Boruto to do it again—this time, unleashing Momoshiki's power against Isshiki! Naturally, Boruto is a bit shaken by rushing into battle with Isshiki and makes a big request of his mentor:
“ Remember last time, when we went to rescue Dad from Momoshiki, you lent me your headband? Can I borrow it again? ” Sasuke hands over the headband, understanding what it means to Boruto.
Finally Naruto, Sasuke and Boruto are now in another dimension to fight Issihiki, with all the points to release their respective full powers.
Via: Ovice