 After his mother s death, Gen Hiraga, a student, learns that he has a grandmother, a mysterious masked woman whose wealth amazes him. Her young-looking, but self-described 416-year-old maid, Beth, behaves oddly, alternating servility with sexual aggression. Gen too can be a sexual demon. A blond American, Jennifer Collins, follows him: she s studying the Hiraga line and eternal life. At his new college, Gen meets a woman who resembles a silent beauty he sees repeatedly in his dreams. His grandmother wants to save Gen from one family curse, an early death; the alternative may be no death at all. Gen s golden semen may contain the clue that will unlock the mysteries.