When Yoshimori is chasing after Kaguro (actually it is Shion, who is dressed up as Kaguro) during the Kokuboro assault on Karasumori site, he follows Yoshimori secretly but winds up getting caught by the Kokuboro members. He is rescued by Yoshimori and helps (albeit briefly) in the following fight against Kaguro. In the latest manga chapters, he is instructed by Masamori to observe the ones chosen by Karasumori. In order to do this he, and fellow intelligence division member Shuu (who transferred from the combat division with Sen), are enrolled in the same school as Yoshimori and Tokine. It has been revealed that Sen possesses the ability to read into the minds of people although, so far, he can only see their outermost thoughts. He hates being reminded that he has feminine looks and is afraid of bugs.

(Source: Wikipedia)