I'm going to yap a lot here and you've to read it all.

So, have you ever heard about Yakuza? And you thought to yourself, yeah, they are a big, powerful organization, all tied together, no, it's not, it's so wrong

Yakuza, also known as gokudō, are members of transnational organized crime syndicates originating in Japan.

what are transnational organized crime syndicates?
Basically: involving groups or markets of individuals working in more than one country to plan and execute illegal business ventures

how it works for Yakuza?

Yakuza would get divided into four Syndicates

From the largest to the much smaller ones:
Although yakuza membership has declined following an anti-gang law aimed specifically at yakuza and passed by the Japanese government in 1992, there are thought to be about 18,800 active yakuza members in Japan today, this story would take place in the early months of 2017

The Yamaguchi-gumi is the largest yakuza family, with about 3,300 members.
in it's peak day, it had around 40,000 members, and also had a long history of many splits, so not that stable, but still an important figure

Founded1915; 110 years ago

Founder: Harukichi Yamaguchi

Territories: Primarily based in Kobe but has territory all over Japan, including in Nagoya, Tokyo and Hawaii, United States

Curren leader: Kenichi Shinoda since August 2005

Membership in 2017: 23,000–24,000

Rivals: Kobe Yamaguchi-gumi
Kizuna-kai
Ikeda-gumi

Allies:Inagawa-kai
Soai-kai
Matsuba-kai
Kyōsei-kai
Aizukotetsu-kai
Toa-kai
Fukuhaku-kai
Gōda-ikka
Shinwa-kai

The Sumiyoshi-kai is the second-largest yakuza family, with 2,100 members. Sumiyoshi-kai is a confederation of smaller yakuza groups. Its current head (会長 oyabun) is Isao Seki.

Founded1958; 67 years ago

Allies:Historically neutral or loose understanding with Inagawa-kai; occasionally aligned with Kobe factions (2015 split period, informally).

Current leader: Shūji Ogawa

membership in 2017: 4,500–5,000

Territories:Tokyo,Strong in Kanto region (Tokyo, Saitama, Chiba)

Rivals: Longtime rival to Yamaguchi-gumi (esp. in Tokyo turf wars) but not that serious

Also occasional conflicts with smaller Kantō-based groups.

The Inagawa-kai is the third-largest yakuza family in Japan, with roughly 1,600 members. It is based in the Tokyo-Yokohama area and was one of the first yakuza families to expand its operations outside of Japan.

Founded:1949

Founder:Kakuji Inagawa

current leader: Kiyota Jiro (since 2009)

Territories: Yokohama
- Strong in Kanagawa, Shizuoka, Tokyo metropolitan

Membership: ~3,300–3,500

Allies: Occasionally cooperative with Sumiyoshi-kai (especially against Yamaguchi expansion). Also maintained overseas ties with Chinese and Korean groups.

Rivals: Competed with Yamaguchi-gumi for influence in Kanto; occasional local friction with Sumiyoshi factions too.

The Kobe Yamaguchi-gumi is the fourth-largest yakuza family, with 120 members. They are a splinter group that broke away from the Yamaguchi-gumi family in 2015. This bot is related to this particular event, from the two other splits from the Yamaguchi-gumi's history

Founded:2015

Founder:Kunio Inoue

Founding location:Hyogo, Japan

Territory:Kobe, plus Kansai & Chūbu

Rivals: Yamaguchi-gumi, Kizuna Kai

Membership in 2017: 6,100

Now let's get to the main Storyline

On August 27, 2015, Japanese police confirmed that powerful factions, including the Kobe-based Yamaken-gumi, the Osaka-based Takumi-gumi, and the Kyoyu-kai, broke away from the Yamaguchi-gumi and formed a new group called the Kobe Yamaguchi-gumi

The question is; What caused this to happen?
Resentment toward 6th kumichō Kenichi Shinoda: favoritism, financial disputes, Kansai bosses felt marginalized. Soon after their split, shootings, arson and assassinations started happening, both sides lost men, and their conflict continued from August 2015 until something unexpected happened in April 2017, another breakaway but this time it was not from Yamaken-gumi, but from the Kobe Yamaguchi-gumi themselves,

What Caused this to happen? in the worst moment

Internal dissatisfaction within Kobe Yamaguchi-gumi — many felt Kunio Inoue was too cautious, ineffective, and losing ground in the war with Yamaguchi-gumi . Yoshinori Oda (former Kobe executive) broke away to form the Ninkyo Yamaguchi-gumi in April 2017.

And now Kobe Yamaguchi-gumi was fighting in a two-front war, a three-way standoff.

a new front Ninkyo: ~1,500

some may say that the Police got involved and started cracking down hard, forcing an unofficial cooling off,

BUT NO

instead some else happened, Kunio Inoue(Kobe Yamaguchi-gumi) made a deal with the devil, with Kenichi Shinoda(Yamaguchi-gumi), a cease-fire, because himself knows better than he can't last long fighting two fronts. It doesn't mean that they'll end their hostility; no it was going to be like a Truce, at what cost? Well, a marriage between the two organizations.

Kenichi Shinoda only son, and Kunio Inoue daughter, Haruka Inoue

This was the only thing that Kenichi Shinoda agreed on, for the Truce

A forceful marriage

after the Ninkyo split, Haruka Inoue who was far from all the dramas and has been studying Literature / History in the Sapporo, and also teaching it, after hearing the new about the Ninkyo split, already know what was going to happen, and was willing to Paying tribute to his father's efforts, that brought her in the states that she was today, so after her father made a phone call to her, and explain the agreement, she didn't hesitate and agree, without any pause or protest, she booked the first flight to Tokyo

and arrived in Tokyo in no time.....