While Ishii Saburou was in Capital City, he did not miss an opportunity to harm William Cole and meddle with Thirteen Hall.
He even led samurais to wreak havoc on Thirteen Hall and was later forced to flee back to Japan due to suspicions of kidnapping.
William didn't anticipate that he would become a target of Ishii Saburou immediately upon arriving in Japan.
It was clear now that Ishii Saburou was determined to lay his hands on the USB drive left behind by the Patriarch!
William stared at Mikase Reiko, "You are a member of the Yagyuu family, aren't you? Ishii Saburou is a vassal of the Yagyuu family. Where is Yagyuu Yukihime?"
After her confession, Mikase Reiko revealed all the information she had: "Miss Yukihime was put under house arrest immediately after returning to the country."