"I won't let you go any further!!" Mugensai unites with the giant god Susanoo and invades Oguraike. Takasugi, Katsura, Yoshinobu, and the Shinsengumi resolutely confront him in order to stop his ambition to create a war-torn world. Even if you get hurt or fall down, your will will never bend! The irreversible fate (Unresettable Crisis) that has been toying with the patriots for a long time is finally coming to an end!! And what is the new era ahead of that fate?