Takasugi and Katsura have learned Mugensai`s true identity within the torrent of time. Once back in the altered timeline, Takasugi has his eye on a final showdown at the giant castle Susanoo. Katsura, along with Sakamoto, Yoshinobu, and the others, try to convince him on another plan of action, but Takasugi takes off on his own. Meanwhile, at the castle, Mugensai is making his own defensive preparations with Kondo and the Shinsengumi. Furthermore, the chronometer has begun to emit a strange black smoke as if it has its own consciousness. Without warning, ominous noises rumble through the castle. The final battle of the patriots living in this tumultuous time has finally arrived!