"Oyaji (Father)," of which J.J. Sonny Chiba is both the director and star, seems to be one of those twilight-year projects former tough-guy stars use to keep the flame flickering. Chiba plays not a cop, gangster or other standard-issue macho man, but a ghost, Ryudo Numata, who appears to his dysfunctional family during the midsummer Obon holiday, when the dead traditionally visit the world of the living.