Hozuki Castle is a prison run by the Hidden Grass, well known for being notoriously difficult to escape from. Boruto and Mitsuki are sent there to protect Kokuri, a former member of a brutal band of robbers known as the Mujina Gang who's now targeted by assassins after betraying and deserting the gang.

Boruto and his team try to get Kokuri assigned to the same cell, but the warden, Benga, shuts the idea down. Looking for a weakness in Benga, they approach Doragu, the leader among the prisoners, for information they can exploit. Doragu is willing to give them information, but in exchange Boruto and the team must undergo a test of perseverance.

It is discovered that a wooden tag used to prevent unauthorized entry into the medical unit has been stolen, and the prison guards begin a search for the culprit. Until the offender is found, all prisoners are locked in their cells. Once the culprit is found, each of their cellmates will be forced into solitary confinement. If this happens and the team becomes separated from Kokuri, their mission could be jeopardized.

Boruto and the others can't help but feel that Kokuri is hiding something from them. Meanwhile, Tsukiyo, a lieutenant in the Mujina Gang who's also imprisoned in Hozuki Castle, schemes to get Kokuri transferred to Hozuki Castle II, where his henchmen lie in wait.

Boruto and Mitsuki worry that their mission is in jeopardy, since Kokuri is scheduled to be transferred to Hozuki Castle II. They decide to escape with Kokuri before he's moved. As they discuss their strategy with Sarada, their cellmate Kedama overhears them

The clock ticks down to the rendezvous time for the escape, but there's no word from Sarada. If they miss this chance, everything will be ruined. Boruto puts his faith in Sarada and proceeds as planned with Mitsuki and Kokuri. Meanwhile, Sarada's lost consciousness from falling to the underground level of Hozuki Castle.

Boruto and the team are waiting for the escape boat when Tsukiyo appears. Boruto and his team fight desperately in order to protect Kokuri, but they're tormented by Tsukiyo's jutsu as time threatens to run out on their prison break!

Boruto has a dream about the day he defeated Momoshiki Otsutsuki. It ends up bothering him so much that he can't focus on his mission. He then meets Tento, the son of Ikkyu Madoka—the Feudal Lord of the Land of Fire—who’s in the Hidden Leaf for a meeting with the Hokage.

Boruto's new mission is to guard Tento, who is obsessed with ninja and collecting X Cards. He begs Boruto to teach him ninja skills, and Boruto thinks this will be a good opportunity to knock some sense into Tento. Meanwhile, the Mujina Gang, which had been laying low after Team 7’s infiltration mission at Hozuki Castle, rears its ugly head.

After completing his mission to guard Tento, Boruto is assigned a new B-rank mission with Sarada and Mitsuki. Boruto is excited to start but he finds the rare X Card that he had wanted in his pocket. Realizing that this was from Tento, he goes to their hotel and learns that Tento's life is in danger.

Boruto rushes to save Tento, but Shojoji the leader of the Mujina Gang blocks his way. Boruto dodges to protect Tento, but Shojoji and his Corpse Clone Jutsu prove to be too powerful. In the midst of all this, the mark on Boruto's palm reacts and paralyzes him.

A training class on Medical Ninjutsu is to be held, and each team must send a representative. Sarada is chosen for Team 7. Despite Sakura being a Medical Ninjutsu specialist, Sarada doesn't have a knack for it and being a participant fills her with anxiety.

Tsubaki, Sumire’s replacement on Team 15, is proud of her samurai upbringing and is highly skilled, but her team’s overall mission performance is lackluster. Tsubaki devises a plan to hone her team’s skills, where they fight for who performs best on missions.

Himawari attends the Ninja Academy's trial session where participants get a taste of ninja training. Himawari’s already decided to become a ninja, which annoys Norimaki and Edo, who criticize her for being there just for fun. Things become uncomfortable when they're assigned to the same team.

One rainy night, guided by Mikazuki the cat, Mitsuki rescues an injured man. Mysteriously, Mikazuki seems to take a liking to the man who says he’s come to visit his sister who works in the Leaf Village. Soon after, Team 7 is assigned to back up the Leaf Police Force on a security mission. Their client is a president of a company who is being targeted by a serial killer known as "The Rainy Day Killer.