Boruto and his classmates head to the Village Hidden in the Mist in the Land of Water for a field trip. Kagura Karatachi is chosen as the village guide. About the same age as Boruto, Kagura is already an accomplished shinobi and serves as an aide to the Mizukage, Chojuro. Once known as the Blood Mist Village, it's now more modern and bustling than anyone could have imagined. However, dissatisfaction exists among some Hidden Mist Shinobi.

Boruto and his classmates are invited to tour the Hidden Mist Academy under Kagura and Chojuro's escort. The Hidden Mist emphasizes swordsmanship, and Boruto is awed by their intense training sessions. Chojuro sees Boruto's interest and arranges a sparring match with Kagura, who seems hesitant. Kagura is extremely skilled and has been asked by Chojuro to become the successor to his Great Twin Sword, Hiramekarei, but he has declined.

Tsurushi Hachiya, Kagura's former classmate at the Academy, finds Boruto and his friends from the Leaf irritating, so he kidnaps Denki. Kagura and Boruto set out to rescue him, and they find themselves in a battle against Hachiya and his crew. During the fight, the truth that Kagura has been hiding is revealed!

Kagura makes up his mind to accept the famed sword Hiramekarei from Chojuro, but unwittingly becomes part of a plot set up by Kagura’s old acquaintance, Shizuma Hoshigaki, a man who opposes the new, peaceful shinobi order.

Kagura unlocks the storeroom to let Shizuma take the Mist Blades. The New Seven Ninja Swordsmen begin an insurrection, the end goal being to turn their village back into the Blood Mist Village! News of the rebellion reaches Chojuro and Mei, the current and previous Mizukage. They are determined to execute the perpetrators, along with Kagura, who aided them. In order to change Chojuro's mind, Boruto makes an astonishing announcement.

Chojuro leads Boruto and Sarada to the location where Shizuma and his "New Seven Shinobi Swordsmen" are based. Shizuma uses his jutsu to create a fog that clouds the trio's vision, and they end up getting separated. Sarada is forced into one-on-one combat with a kunoichi, Buntan Kurosuki, who wields the Lightning Blade, Kiba the Fang! In the thick fog, Sarada uses her Sharingan, but her enemy is stronger than expected. Driven into a corner, she comes up with a counterattack. Meanwhile, Boruto goes up against none other than Kagura.

Boruto urges his friend Kagura to return with him, but Kagura rejects him and begins to attack. Although Boruto is desperate to save him, Kagura once again falls under a spell and is unable to defy Shizuma. Then someone steps in between the two as they battle. It's Mitsuki, and he has obtained intel about the rebellion. Just what is the intel, and can Boruto save his friend?

The field trip comes to an end, and Boruto and his friends prepare to return to Hidden Leaf. Chojuro, the Mizukage, sees them off, but Kagura is nowhere to be seen. The class makes it back to the Leaf Village safely and Boruto is relieved to be home. But Himawari isn't her usual cheerful self. She's been looking forward to the souvenir that Boruto promised her, which he completely forgot to get! Boruto decides to tell the truth and beg for Himawari's forgiveness, but he misses his chance, and things gets worse!

Inojin has loved to draw since he was small, and his ninjutsu speciality is the Super Beast Scroll. But one day, he suddenly loses his ability to use his jutsu! Puzzled, he talks to his father, Sai, who uses the same jutsu. Even though Sai is sympathetic, he doesn't give Inojin a way to overcome his slump. Instead he suggests that his son enter into a children's art contest, which Inojin halfheartedly does.

Boruto and his classmates decide to go camping to try to catch the mysterious fish, the Eternal Carp, said to be unforgettably delicious. With graduation coming up this could be the last time the class does something together, so Boruto figures this is the perfect opportunity to catch one, but the fish proves to be very elusive.