Kekkaishi Vol. 9 (manga)

The three kekkaishi-in-arms--Tokine, Yoshimori, and Gen--are not getting along! So much so that Gen's sensei, Atora, challenges them to a task requiring real teamwork! Meanwhile, when the Kokuboro princess falls ill, the ayakashi pursue her cure in increasingly nefarious ways. Plus, Gen receives a strange gift from an enemy--one that may reveal something about himself that he would prefer not to know!