Well, the 'the yakuza falls in love novel' could be a complex tale. It may explore how the strict and often violent world of the yakuza clashes with the tender and vulnerable concept of love. The protagonist, being a yakuza, would likely have a past filled with illegal and unethical deeds. When love enters his life, he has to face not only his own internal demons but also the external threats from rival yakuza groups or those who don't want to see him change. It could be a story of redemption, sacrifice, and the power of love to transform a person from a life of crime.
The plot is about the unexpected romance that blossoms between a yakuza member and someone unexpected. It's appealing because of the unique mix of action and romance.