Kekkaishi, Volume 1 includes the first seven chapters of Yellow Tanabe’s manga of the same name.
Young Yoshimori Sumimura is in training to become the 22nd demon-fighting kekkaishi of the Sumimura lineage. His neighbour Tokine Yukimura is also in training to become a kekkaishi for her own family lineage. The two opposed branches of the Hazama clan have lived side by side for 400 years and for most of that time the two families have been bitter rivals, a tradition Yoshimori’s grandfather and Tokine’s grandmother maintain to the modern day. Consequently, Yoshimori and Tokine have kept their friendship secret.
Tokine is two years older, weaker, more studious, and far more skilled than Yoshimori. Yoshimori compensates for his lack of diligence with raw power. Yoshimori’s carelessness allows a demon Ayakashi to gravely injure Tokine, an event that that forever changes the repentant Yoshimori.