The Yakuza games story portrays Yakuza culture in several ways. It shows their hierarchical structure. The higher - ups have great power and respect, and the lower - level members have to follow strict rules. Also, their sense of justice within their own world is depicted. They have their own way of dealing with disputes and traitors which is part of their unique culture.
It's also possible that Hana is related to one of Naruto's friends. Maybe she's Kiba's sister or something. And because of her connection to Naruto's friend, Naruto feels responsible for her safety. So when she's in trouble, Naruto steps in to save her without hesitation.
Hana could be an original character created for this fanfiction. Maybe she is a new ninja in the village who Naruto falls for, but she has a hidden agenda that ends up breaking his heart.
One of the best yakuza stories is about loyalty within the yakuza clans. For example, there are tales of yakuza members who would sacrifice themselves to protect their bosses. They consider honor and loyalty above all else, and these stories often show how they adhere to a strict code of conduct even in the face of danger.
One of the well - known best yakuza novels is 'Tokyo Underworld' by Robert Whiting. It delves deep into the seedy underworld of the yakuza in Tokyo, showing their power struggles, criminal activities, and the complex web of relationships within the organization. Another great one could be 'Out' by Natsuo Kirino. Although not strictly a traditional yakuza - centric novel, it involves elements of the criminal underworld where the yakuza operate, and it's a very gripping story of women involved in a crime related to the yakuza world. Then there's 'Six Four' by Hideo Yokoyama which also touches on the yakuza influence in Japanese society among other complex themes.
Yakuza 0 isn't based on reality. It offers a unique and immersive fictional story filled with action, drama, and adventure. The game stands on its own as a work of fiction.