S1·E48 Crumbling Castle

As the castle begins to fall apart, Masamori and his night troops head into Kokubouro with the path created by Tokiko. Yoshimori rescued Sen and tells him to go back home while he still can. Wanting to be of some use to Yoshimori, Sen offers to help locate Kaguro. With Sen's help, Yoshimori speeds off to find Kaguro leaving Sen behind. Tokine manages to find the whereabouts of Yoshimori with Sen's information and heads off to Yoshimori with the intention of bringing him back to Karasumori before the castle completely collapses.