Kekkaishi, Vol. 18

Brother must rely upon brother in a daring escape! So why does Masumori send Yoshimori's friends to spy on him at the Karasumori Site? Then, when a flock of beautiful butterflies descends on Karasumori High School, all the students fall ill...How can Yoshimori single-handedly battle thousands of tiny ayakashi without harming the people in their midst?