In Edo, where Gintoki and the Yorozuya reside, order is maintained by the Shinsengumi. Toshiro Hijikata, known as the "Demon Vice-Commander," has long led the Shinsengumi with strict discipline. However, after obtaining a cursed demonic sword from a blacksmith, his personality drastically changes due to the curse—turning him into a completely useless good-for-nothing. Justas he’s cornered by a group of rogue samurai in a life-or-death situation, the one who saves this pathetic Hijikata is none other than the Shinsengumi’s tactician, Ito Kamotaro, who has finally returned to Edo after completing a long-awaited mission.

Kamotaro comes back bearing the latest weapons and prized swords as souvenirs, receiving a grand welcome from Commander Kondo. His accomplishments are highly praised, and he gradually begins rising in prominence within the Shinsengumi.

Meanwhile, Hijikata, who has been making repeated mistakes due to the sword’s curse and is eventually expelled from the Shinsengumi, finds himself standing before Gintoki...