11th year of the Meiji Era in downtown Tokyo. Kaoru Kamiya, the acting master of the “Kamiya Kasshin-ryu” style, was chasing after the “Hitokiri Battosai,” who was claiming to be a user of her sword style. One night, Kaoru meets a man carrying a sword. She immediately questions the man, but he seems to have absolutely no will to fight. “Is this the rumored Hitokiri Battosai?” As Kaoru dubiously looks on, the man introduces himself as Kenshin Himura, a “Rurouni.”

Knowing how strong Kenshin was when he was the Hitokiri Battosai, Jine takes Kaoru hostage in order to fuel Kenshin's anger. The two engage in a fierce battle. However, Jine, believing that Kenshin has not yet regained his former strength, inflicts the Nikaido Heiho "Shin no Ippo" on Kaoru, causing her to stop breathing. With only two minutes until Kaoru dies of asphyxiation - Kenshin's anger reaches its peak.

In order to kill Kenshin, Kanryu uses his Gatling gun and rains a flurry of bullets at him, uncaring that the Oniwaban Group that was under his command would also be hit by this attack. In the face of this evil act, the Oniwaban Group make full use of their individual abilities to counter the Gatling gun. At this moment, theirs and Kenshin's purpose become one. Kenshin and the Oniwaban group team up to challenge the overwhelming power of a modern weapon.

The person who had sent Hajime to face Kenshin was none other than the Head of the Home Ministry, former Satsuma Domain Revolutionary warrior, Toshimichi Okubo. He asks Kenshin to go to Kyoto to stop the secret plans of a man who claims to be the legitimate successor of the Hitokiri Battosai. However, that man was supposed to have been killed 10 years ago by his own comrades in the government, as they regarded him as a threat. Receiving this request to conduct an assassination, what will Kenshin's answer be...?