In this country, the Gokudo are also a form of power. There are no laws regulating organized crime syndicates, and even the police, politicians, and corporations have vested interests with these giant organizations. At the pinnacle stands the "Kurose-gumi." The boss, Kurose Seiichiro, has many children born to his legal wife and mistresses. However, for Seiichiro, blood ties alone do not qualify one to be his child. In the Kurose family, siblings are made to compete from a young age. Fundraising, territory expansion, negotiation, conflicts, managing subordinates. How much profit one has brought to the group as a Gokudo. This is called their "grade," and the children are constantly ranked. Failure means losing authority. Weakness means being robbed. And sometimes, it means death. Among the once numerous siblings, not a few have already died. Yet, there are still many who survive. In other words, those who remain in the Kurose family now are solely those who have survived this environment.