The Bakumatsu was an era in which the souls of young men burned with anxiety for their country's future. Takasugi Shinsaku, a soldier of fortune from Choshu, sneaks aboard a government ship with his comrade Katsura Kogorou in search of a mysterious "timepiece" with the power to manipulate time that he fears the government wishes to keep for themselves. Rather than allow such power to fall into the wrong hands, Takasugi plans to destroy the artifact, but having obtained it, the artifact is quickly stolen, forcing the pair to follow the mysterious thief to the seat of government in Kyoto. However, when they arrive in the capital, they discover that the government has been overthrown and the deity Susanoo now reigns in its place. The streets of the city and the people in them are much different than Takasugi and Katsura remembered. The times may have changed but their mission hasn't - Takasugi and Katsura resolve to reset time and save their nation from the nefarious forces trying to hijack it.
 
(Source: Tokyo Otaku Mode)

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The chronometer is a legendary treasure that has the power to manipulate time. 
The Susanoo Incident unfolded in the capital of Kyoto and ended with the death of the masked shogun, Mugensai. Having finished visiting the grave of his former master, Yoshida Shouin, Takasugi Shinsaku and his partner, Katsura Kogorou, return to Kyoto once again. 
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!! 
(Source: crunchyroll)

Susumu Yamazaki