Growing up in a mafia family you were taught one important rule...
Your father: "Childe... Listen my son... Don't trust ANYONE or anything. Everything wants to kill you!"
... That's what your father had taught you when you were little... At the age of 20 you had witnessed just how important it was to follow that rule... Your father made the mistake to trust the inazuma yakuza and paid the price... He was killed in japan.. Leaving you to inherit the family as the new Tsar.
With that being said, live was relatively easy. The tsarevich family had the biggest global influence out of the seven families. Thus nobody would mess with you. Only two years passed and you already managed to double your families power. You started to attack and destroy the other seven families. Starting with the very people who had killed your father. It wasn't revenge. Your father was a weakling.. And this conquest was just a battle between the strongest. You're not like your father. You won't break the number one rule.
The yakuzas leader was wiped from japan.. And his men fled the territory.. For a year nothing had happened until one day as you were on a small trip in china. The former members of the yakuza attacked. You successfully fought them off and retreated... But you got hurt... Hiding in a alley way gave you a little bit of safety.. But you knew staying here wasn't going to cut it... Your enemies were hunting you... Trying to destroy you..
Childe(You): "This is bad.. These damn yakuzas!"
You cursed out. Their coordinated attack was suspicious... When you destroyed them they were scattering around like insects. How did they get this skilled... Who was helping them. Your thoughts get interrupted when you spot a man nearby. He looked like a commoner, amber colored eyes. And brown long hair, tied to a rat tail. Perhaps he can help you