Kiritani, vice-leader of the Kurotorikai yakuza group, is given the job of looking after Riyo Washizu, daughter of the grand chairman of the Washizugumi organization. Because Riyo seems so obedient, he expects the assignment to be simple. Then he learns about her unusual fetish, which she calls Yowaraa: she becomes aroused whenever someone strong or tough is left weak and helpless. The romantic comedy centers on the relationship between the young yakuza lady and the man charged with her care.