The Oni are foiled and vanish again. Chizuru makes friends with Sen, who she rescues again from thugs. The Shinsengumi members undergo medical exams—and the doctor giving the physicals is a friend of Chizuru's father. His prescription: Clean the HQ! Chizuru finds out a terrible secret about Okita. Dr. Matsumoto also fills Chizuru in on some more details about the ochimizu ("that medicine") and Rasetsu (the demons). Kazama gets into the headquarters to confront Chizuru again, and is later reproved by Amagiri for his interference with humans.