Bakumatsu S02E01 - Black Ship Invasion and Mugensai's Return!

"We still have things we need to do." Takasugi Shinsaku and Katsura Kogoro have finished tending to Yoshida Shoin`s grave in Hagi. They return to Kyoto in order to correct the flow of time thrown off balance by the legendary treasure, the chronometer. Suddenly, the earth trembles and the sky splits open, and the chronometer, which was supposed to have been destroyed, appears from a rift in space-time. Now with a will of its own, the chronometer starts going on an uncontrollable rampage! Standing in their way is Takasugi`s fated rival, vice commander of the Shinsengumi, Hijikata Toshizo, who was lost in the previous battle!! Commander of the Shinsengumi, Kondo Isami, refers to the shocking existence of a new Mugensai.