While Katsura, Kondo, and Matsudaira find a way to meet with their accomplices, the Shinsengumi-Jouishishi alliance find a way to sneak in. But trouble brews as the Naraku and the Mimawarigumi arrive, and help arrives in the form of the Yorozuya.
Kozenigata does his usual monologue, involving the concept of humans being prisoners to life and paralleling this to Kondo's situation, concluding that Kondo should not be saved. This leads to Hijikata nearly throwing the detective overboard. Haji tells the Vice Chief to change into prison garbs, since the island, Kokujo, is essentially impregnable and the only way to enter is to pretend that some of the alliance are prisoners. Kozenigata and Haji were able to get sympathizers to sail them to the island but the real trouble starts when the transfer to the prison guards takes place. Hijikata understood; some of them, including Hijikata, was recognizable, so Plan B will be to take over the transport ship with the remaining group if Plan A fails.
As said transport ship arrives, Hijikata thanks Kozenigata and Haji for taking care of him when he was transferred to them, and showing him that there were still good cops in this new world. He also tells them to take care of Edo in his place, including oc the Yorozuya and Tae. Kozenigata responds that the Yoruzuya and his group were stronger than Hijikata thought, and that there will always be a place for Hijikata in Kozenigata's police team. They are all interrupted when one of the fake prisoners notices something strange with the transport ship heading their way. Hijikata sees that the ships crew were all slaughtered, realizing too late that it was a trap before the group's ship is attacked by its canons. All the allies' ships are then attacked by the Naraku and the groups desperately try to fend them off. Hijikata is saved by Kozenigata from an assassin but is injured in the process. The detective tells the Vice Chief to subdue the enemy ship and seeing his hesitation, reminds the other man that their friends were stronger than Hijikata thought. Just then, he sees Haji being saved from a Naraku assassin by Shinpachi and Kagura on a boat with Tae, shooting down the enemy ships' cannons with her umbrella gun. He agrees to stop the ship and jumps between them, attacking the assassins and being surprised to see Gintoki fighting with him.
As they battle, Gintoki is glad that he made it in time to help. Hijikata chastises him for doing so, knowing full well the consequences, being unable to return home. Gintoki answers that it was too late to turn back now and home would not be the same without the Shinsengumi and the Jouishishi, and that the Yorozuya will make sure that everyone comes back alive. Hijikata agrees and thought about how protecting Edo has become more than just a job to him, finally making him a proper member of the Shinsengumi. The two men fight against the assassins.
On the Mimawarigumi airships, Isaburo gets ready with his men to land on the island and capture the escaped prisoners. When only he and Nobume remain, Nobume questions Isaburo's motives. She does not believe that Katsura and the ex-cops were behind the murdered guards but the commissioner dismisses her claims, because he had imprisoned Katsura in the island on purpose for the three men to escape. She asked if his manipulation of the Snack Smile event was to incite a rebellion so that the rebels could be wiped out, but Isaburo answers that it would have been easier if he had just executed Kondo along with them; he was planing to destroy something bigger. He admits though, that Oboro and his Naraku had gotten wind of his plans and because of this, Isaburo needed to start with killing them now.
In a watchtower, Kondo, Matsudaira, and Katsura incapacitated the guards (and nearly themselves due to the darkness and the trio wearing the same uniforms) and sees that the Mimawarigumi had made landfall, making it harder for the Shinsengumi-Jouishishi alliance for the rescue. Katsura answers that he had a secret trump card to help the alliance, Gintoki. In the ocean, Gintoki also sees the police airships and came to the same conclusions; he is glad that they abandoned the bigger ships to the paddle boats. Hijikata angrily berates the Yorozuya for actually being responsible for destroying the big ships, leading to the smaller boats being used. Both Gintoki and Kagura mock the alliance for being "inferior" to the Yorozuya's prowess. In response, Hijikata commands the group to try to beat the Yorozuya to the island, but he and his rowers, the feuding Elizabeth and Saito, are thrown overboard by Okita's boat that was being led by a shark.
The rowboats containing the sympathizers, Haji and the injured Kozenigata watch as the group rows away. Haji is surprised to see this powerful team-up between the three groups, and tells her boss to not die. He agrees, adding that he will wait until they all return.
- Kozenigata Heiji
- Tenshouin Naraku
- Shimura Shinpachi
- Shimura Tae
- Sakata Gintoki
- Matsudaira Katakuriko
Universal travel writer, Marsh Ian, travels to Earth to learn about the dominate species of the planet. In particular he studies one of the last remnants of one of the different types, samurai... named GIntoki.
The alien essayist Marsh Ian documents the life of a Samurai (Poop), Gintoki. He notes that while the old samurai used to fight and be heroic, his Samurai (Poop) subject only enjoys lying around, eating sweet foods and alcohol, and indulging in vices such as gambling. He continues to follow Gintoki, until the latter starts to prepare takoyaki for the Yoruzuya...using Marsh Ian's tentacles. Marsh Ian escapes Earth in fear.
Shortly after, Shinpachi is shown asking Gintoki if they should be slacking off while the Farewell, Shinsengumi Arc is still ongoing. The scene cuts to the TV news showing that the essayist had disappeared and his editor had been arrested for the crime.
- Kasei Jin
- Shimura Tae (Cameo)
- Otose (Cameo)
- Sakata Gintoki
- Sadaharu (Cameo)
- Shimura Shinpachi