Former reporter Tokitsu Daisuke finds a suspicious western-style mansion built over a hill overlooking a provincial village. Awaiting him there is the mansion's mistress, Kiriya Sumi, and her beautiful daughters.

Sumi informs Daisuke which he may be decided to get to be the next patriarch, the only real penis of the Kiriya family. Inturn, all he has to do is impregnate among her daughters.

However, the Kiriya carries a dark secret inside their bloodline which may well have severe repercussions for Daisuke...