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.

In order to get out of the barrier, Boruto desperately searches for his heart of stone, but he has little success. Then he encounters Sekki, one of the Genbu Three that participated in the recent Chunin Exams. Sekki has also come to the training ground in order to find his heart of stone. Seeing their predicament, Ohnoki tries to help them.

The Hidden Leaf established Parent and Child Day to allow busy parents to spend a day off with their children. Boruto and his sister Himawari await the day with anticipation. The day arrives, and Boruto is happy that his father was able to finish work and come home, so he decides to let Naruto spend all of his time with Himawari.

Kawaki and Himawari participate in a training session in the forest near the academy. The class is split into three-person teams and Kawaki ends up on a different team from Kae. Anxious about losing sight of Kae, Kawaki is unable to focus and ends up burdening his assigned team. Kae is lured away by a mysterious person and disappears. Fearing that she is in danger, Kawaki and Himawari rush to find her.