Kekkaishi Graphic Novel Volume 30

"By Yellow Tanabe Yoshimori's absentee mother, Sumiko, makes an unexpected appearance at Karasumori - but not for a tearful family reunion. Sumiko leads Yoshimori and Tokine through a labyrinth to find and remove the mystical site's mysterious guardian... What does Sumiko know of the circumstances surrounding Tokine's father' s death? Can she be trusted? Can Karasumori's guardian be trusted...? And what fate awaits Karasumori if its guardian leaves?!"