A string of mysterious deaths has occurred, leaving all of the victims with a purple butterfly-shaped bruise. According to investigators, the victims have all died from a hypnotic suggestion. The police bring in renowned psychiatrist Toshiya Saga, who specializes in hypnotic cures, to help with the investigation. He is determined to solve the mystery, but is caught off-guard when the woman he is attracted to becomes a suspect in the investigation.

若手俳優集団D-BOYSが主演を務める大河ロマンシリーズ第1部作。「櫻の園」「赤い糸」の柳下大が、プライドが高く金にもなびかない花魁を演じる。明暦3年、男遊郭「菊下楼」のナンバー1花魁の鷹尾は周囲から嫉妬されながらも気高く暮らしていた。そんなある日、お花という少女が兄の仇を討つため男に扮し、男遊郭に現れる。