Sannan has been using materials left behind by Kodo to continue to try to improve the medicine in secret. He drinks the medicine and transforms into something which is no longer human. After seeing the wound Sannan infected on Chizuru heal in an instant, Hijikata asks her if she's a rasetsu, but...
Later, the commotion over Sannan adds to the decision to move the Shinsengumi headquarters to Nishi Hongwanji. Chizuru continues to search for her father, but she is unable to find any clues to his whereabouts. Then one day, Chizuru happens to overhear Okita's secret.
There must have been some 
special reason for it!
!لا بدّ أنّه كان هناك سبب ما وراء ذلك
Dafür muss es einen
besonderen Grund gegeben haben!
Debía tener un motivo para ello.
Debía de tener un motivo para ello.
c’est qu’il devait y avoir
une raison !
Dev'esserci un valido motivo per cui l'ha fatto!
É porque ele devia ter algum motivo!
потому что у него были причины!