Boruto overhears remarks being made about his father and him, adding to the hurt because Naruto has broken his promise to be home for Boruto's birthday. Shortly after, Team 7 is given a mission to capture a gang of thieves targeting the Thunder Train, who are hiding out in a town near the Land of Fire's border. But when Team 7 arrives at the town, they find something is not quite right with one of the captured thieves.

The White Snake Sage tells Boruto to bring back the "Reverse Scale" from Garaga, a troublesome snake. Boruto and his friends head deeper into Ryuchi Cave and are confronted by a giant serpent. It is Garaga, the very one they seek, but its sheer power has the gang backed into a corner. Meanwhile, Moegi reports that Mitsuki's disappearance might involve someone who has access to crucial village secrets.