The episode begins with a boy excitedly pointing at horses, just before an explosion prompts Kawaji to order immediate aid for the injured and the evacuation of the area. Amid the chaos, Hinazuru declares that she is acting for "Boshin" and recognizes Shizuma, who in turn identifies her as Sumie. Shimura confronts Ohkubo Toshimichi, calling him a traitor and challenging him.

Parallel to the main conflict, a subplot unfolds where Parks and Senri discuss an attack on Ohkubo and a strange incident where the moon disappeared and wooden carp fell from the sky. Senri is tasked with investigating this bizarre event instead of looking into why Ohkubo was assassinated.

Later in the episode, a plan by Hiramatsu Buhei is revealed, aiming to exploit the political vacuum created by Ohkubo's potential assassination to rally the former samurai of Satsuma against the government. This revelation sparks discussions among government officials about the threat posed by these former samurai and the need for preventive measures to quell their uprising.

Complicating matters further, Shizuma encounters figures from his past, including his mentor Koto and his fiancée, who now works as an assassin for the mysterious "Master" orchestrating attacks against the government.

The episode also delves into the preparations and alliances forged by various factions in anticipation of a larger conflict, highlighting the strategic maneuvers of the characters.