As Boruto is escorted back to general population, someone sneaks into the medical ward, and stabs Kokuri on Tsukiyo's orders. Tsukiyo communicates with someone from solitary through notes. Boruto explains Konoha got his letter and sent him. Boruto wakes up again, restrained by Kokuri, who thinks he's there to kill him. Boruto wakes up in the medical ward a day later, but is knocked out by Kokuri when he asks for him. Boruto eats the poisonous fruit and is sent to the medical ward. Mitsuki manages to grab one with a snake during recreation time. Arai explains it's difficult to be sent there, but that eating the poisonous plants that grow around the prison should be enough. They learn that the Mujina's number two, Tsukiyo, is in solitary after getting into a fight with Kokuri, the defector they're supposed to protect, who was sent to the medical ward. Arai shows Boruto and Mitsuki who can smuggle things in for them. He believes Mujō is too soft on the prisoners because he thinks they can be rehabilitated. Benga shows Sarada around and answers her questions.

Boruto and Mitsuki are introduced to their cell-mates, and claim to be from the Land of Water, serving eight years for robbery. Sarada is to infiltrate the prison by posing as a journalism student conducting research. Konohagakure was able to arrange with the master of the prison to have a fake brand applied to Boruto and Mitsuki. Boruto and Mitsuki were sent because arrangements to have Kokuri protected inside would take too long, as Kusagakure, who administers the prison, hasn't been targeted by the Mujina's crimes, so they don't feel obligated to prioritise obtaining that information. Boruto and Mitsuki think back to being assigned a mission to infiltrate the prison, and collect information on who the leader of the Mujina Bandits is from a former member before the bandits can have him killed inside. One of the prisoners attempts to escape, activating Mujō's jutsu. Mujō explains their new status as prisoners, and leaves Benga to give further explanations. ' The Shinobi Prison: Hozuki Castle' ( 忍監獄・鬼灯城, Shinobi Kangoku: Hōzuki-jō) is episode 141 of the Boruto: Naruto Next Generations anime.Ī group of prisoners are taken by boat to Hōzuki Castle, where they are branded by the warden, among the prisoners are Boruto and Mitsuki.

Naruto blood prison already over