After the infinity castel war

kimitsu no yaiba-1 (hidden identities)

After the infinity castel war there were only three hashira alive

Rin aiko
The moon hashira

Shinazugawa sanemi
The wind hashira

Tomioka giyuu
The water hashira

After the battle

These were the only three hashiras who survived after the battle and their own lives were in danger because they were the hashiras the people who killed the demon king muzan kibtauji.

So they decided to create a mafia organization

The most dangerous mafia organization in the world

Aiko after the battle had made a best friend

Shanaya verma
Her partner in crime . The person who filled the gap which mitsuri and shinobi left behind

BTS
The people who can even make Shanaya a blushing mess and were the owner of the KIM company

Aiko lived with Shanaya not because she couldn't buy a house because Shanaya wanted that aiko should not be left out and she just knew that aiko was an orphan not about her being a hashira the reincarnated version of the moon..

Shanaya's family

Shanaya's father
The ceo of the verma company (we will refer him as "s/d")

Shanaya's mother
A lawyer in the high court (s/m)

Shanaya's dadi
A toxic person who hates girls and shanya was the first girl

Shanaya's brother (younger)
Arav
Dadi favours him alotttttt but even dadi also knows that Shanaya is way successful and the house they were living in was shanaya's

Aiko , sanemi , and giyuu didn't have any siblings and those three were in a relationship ship and 2 kings and 1 queen of the whole mafia world
But but but no one knows about their secret identity as hashiras