Okazaki is a happy child. Pampered by loving parents, loved by all his classmates, he is the typical Japanese middle-class boy of the seventies, heading towards a peaceful life. But his grandmother's serious illness changes everything. Her mother, distraught, becomes part of a sect, becoming violent, authoritarian and intolerant. Her new "spiritual master" teaches her that anyone who is not with them is an enemy, a creature of the "Demon"