Kamui is a ninja from the Edo period who has decided to leave his clan. After doing so he is pursued relentlessly by the members of his former clan; who consider him to be a traitor and therefore wish to kill him. Kamui then wanders around Japan to escape from them by using his intelligence and great abilities to survive. In the course of the series Kamui begins to suffer from paranoia because of his status as a persecuted man. Kamui then started to believe that everybody wished to murder him and became distrusting of everyone he came across.

Freed from the rule of samurai 150 years ago, the people of Hinomoto live peaceful lives and revere their liberators—demons whose true forms remain elusive—as gods. Fated to mine rocks for the demons to feast on, Musashi knows the grim truth: humanity is enslaved by these otherworldly beings and the samurai are the last bastion fighting for freedom. Hiding his true opinion from his peers and growing distant from his childhood friend Kojirou Kanemaki, Musashi lives in angst until the day of his graduation. When the fresh graduates arrive at the mine, they are horrified to see the inhumane treatment of miners and the uncanny physical appearance of their overseers. However, Musashi manages to endure thanks to Kojirou's help. As the demon leader wreaks havoc on the quarry, Musashi is saved once more from certain death by the Takeda samurai clan. Recovering from humiliation and yearning for adventure, Musashi embarks on a journey to become a samurai and form his own clan!

According to Tsutaya Online, the DVD of Gintama: Shinyaku Benizakura-hen will be released on December 15th. A new special will be bundled with the limited edition. It's the running gag of Ben Johnson episode where animation staff reuse the New Years footage; Yorozuya would sit around the kotatsu eating a bowl of tangerines. They discuss elaborate subjects, Shinpachi complains about reusing animation footage, and then Gin-chan always ending the gag with a pointless announcement.

Two years have passed following the Tendoshuu's invasion of the O-Edo Central Terminal. Since then, the Yorozuya have gone their separate ways. Foreseeing Utsuro's return, Gintoki Sakata begins surveying Earth's ley lines for traces of the other man's Altana. After an encounter with the remnants of the Tendoshuu—who continue to press on in search of immortality—Gintoki returns to Edo. Later, the regrouped Shinsengumi and Yorozuya begin an attack on the occupied Central Terminal. With the Altana harvested by the wreckage of the Tendoshuu's ship in danger of detonating, the Yorozuya and their allies fight their enemies while the safety of Edo—and the rest of the world—hangs in the balance. Fulfilling the wishes of their teacher, Shouyou Yoshida's former students unite and relive their pasts one final time in an attempt to save their futures.