The Demon's Lifeline - S1.E6

The Shinsegumi wait to see if Sannan-san recovers from his violent reaction to "that medicine" - and work to keep Itou from noticing. Chizuru has a fuller truth revealed to her because of the incident. While on patrol, she and the soldiers rescue a young woman who looks almost exactly like Chizuru, who still dresses like a boy. Later, as the Shinsengumi take up guard duty for the Shōgun's visit, the three strangers - calling themselves "Oni" - try to kidnap Chizuru.