Merely by having a square birthmark on his hand, Yoshimori was destined for
a job he never really wanted. However, in order to protect the girl that
once protected him, Yoshi assumes his grand position a kekkaishi ("barrier
master"). The series is brings together many interesting and unique
characters and avoid many of the standard cliches that go with most generic
action-adventure mangas. As Yoshi and Tokine traverse between battling odd
creatures and surviving school, they evolve and show just how genuine this
series can be.
synopsis by GreatTeacherStone