Bakumatsu

"They are both opponents I`m closely linked to, after all." Okita and the Shinsengumi discover Ryoma and Izo`s hiding place, and Mugensai joins them as they pursue the pair. Ryoma and Izo hatch a plan to trick Mugensai with a fake chronometer and split up, but before they can carry out that plan, they are found by Mugensai and the Shinsengumi. Meanwhile, Yoshinobu turns to a still bickering Takasugi and Katsura for help in rescuing the captured emperor. Suspecting that he knows the true identity of his master, Kondo speaks with Mugensai.

"Toshi...!" Kondo and Okita try to help free their beloved friend from the evil spell of the chronometer. However, Mori Ranmaru appears and arrests both Kondo and Okita, throwing them in a cell for treason. At the same time, Takasugi and the others sneak into the giant castle Susanoo in order to free the emperor, but come across a hidden surprise. Ryoma has also come to the castle seeking revenge for his fallen friend, Izo and to retrieve the chronometer. As things come to a head, Katsura finally admits to Takasugi the reason he has been secretly looking for the chronometer alone.

"Kyoto has vanished?" Right after finally getting rid of the twelve commanders of Susanoo, Takasugi and the others find themselves surrounded by a vast plain. Seimei explains the shocking truth that Susanoo Castle has traveled back to the distant past, and taken them with it! They`re not alone though, Mugensai has also been pulled back in time with the castle. Takasugi squares off against his masked foe, but a lucky blow reveals a familiar face hidden underneath. Meanwhile, back in the other time period, Sakamoto stares at the remains of the castle and clutches the chronometer as he contemplates what to do to bring back his friends.

"You`re not going anywhere!!" Having become one with the giant castle Susanoo, the hulking figure of the castle and Mugensai stalks towards Lake Ogura to make his plan to plunge Japan into a world of unending war a reality. However, Takasugi, Katsura, Yoshinobu, and the Shinsengumi stand in his way and put their lives on the line to prevent his plan from taking fruit. The longstanding conflict that Takasugi and his companions have been struggling to deal with finally seems to be near its end! How will their feelings surrounding the chronometer be resolved? And what new age will be awaiting them when this is all finished?