Kyoto, Japan. The heroine meets a man who gives her a pocket watch somehow leading to a Torii in a shrine, and suddenly it warps her into the Bakumatsu period. In the world of where there is such a difference in importance of value, she tries to find a way to go back. When she meets a man who has crossed time and says, "I will live for you," a love story between the two blossoms.

[Source: MyAnimeList News]

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 Shoin, Takasugi Shinsaku and his partner, Katsura Kogoro, 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]