The Mamiya family maintains a scandalous secret, viewing sexual intimacy as the ultimate form of family bonding. When curious neighbors Nanae and Yachiyo discover the truth, they are quickly seduced and manipulated into joining the taboo practices through hypnosis and pleasure. As Mamiya expands his influence over the neighborhood women, the local association president, Ruiko, vows to put an end to the family's indecent behavior.
Yuuichi continues to expand his influence over the neighborhood using his hypnotic light pen, first breaking the will of the strict neighborhood association president, Ruiko. As rumors of his activities spread, Yuuichi orchestrates a massive public event during the local festival, hypnotizing the town's women into becoming shrine maidens. Under the guise of a religious ritual, he assumes the role of the "Sacred Medium," leading a town-wide orgy where the women, including his own family, strive to be blessed by his seed.