Shinsengumi!

Osaka Castle was erected as a result of Hideyoshi Hashiba's (portrayed by Shindo Eitaro) solicitation from Kyogoku Tatsuko to become his consort. During more than 30 years, until the devastation of the castle caused by the Summer Siege of Osaka, a series of tragedies unfold, affecting various women who found themselves at the mercy of fate..

Villain or hero, Taira no Kiyomori changed Japanese history forever 900 years ago. Without ever knowing his real father, Kiyomori was raised as a samurai. Together with his stepfather, he wiped out piracy along Japan's western coast, becoming a full-fledged warrior samurai. In an age when samurai were looked down on as members of the lower class, Kiyomori was skillful at winning the hearts and minds of the people. By rounding up surrendered pirates and achieving other successes, Kiyomori eventually became the de facto ruler of Japan.

It is the Edo period during the ninth Shogun Ieshige's reign. Orin's father was falsely accused of attempting to assassinate the former Shogun Yoshimune and in accordance with her father's wishes, Orin joins the secret assassination group Tegusari-nin, headed by Uemura Doestsu. In the organization, Orin fights through many dangers. But one day, she realizes she is being used by Doetsu in order to advance his ambition.

Sakazaki Iwane is a ronin who spends idle days in Edo. Until a few months ago, he was a promising son and successor to a powerful family in Bungo. He has came back to Edo, where he lived for a while for swordplay training with his two best friends, after a tragedy in the three's home domain—both of the two friends died, one of them killed by Iwane by command of the domain lord's chief retainer. Iwane left his home for Edo, leaving behind his fiancée, a sister of the friend he killed. Eventually, Iwane detects the conspiracy behind the deaths of the two friends and struggles to reform his domain.

The year is 1863 as the tumultuous samurai era is coming to an end, Japan is split between the pro-shogunate and anti-shogunate factions. The fate of the world is threatened as an army of historical revisionists are sent from the future to alter the course of history. In order to bring these forces down and protect the real history, two sword warriors, spirits who are swords brought to life by Saniwa (sage), rush to Edo. The polite and thoughtful Horikawa Kunihiro and the short tempered yet skillful Izuminokami Kanesada, who served the same master, confront the invading army along with a lively gang of other warriors including Mutsunokami Yoshiyuki, Yagen Toushirou, Tombokiri, and Tsurumaru Kuninaga. As the fate of history lies in these hero's hands, what meets the blade is yet to be uncovered...