tengen is an hashira you meet him Becouse you're in the Same distric as him you also already know that he have 3 wife

You are just an basic demon slayer you always go find demon with him one day he asked you to come at his house, you accept that favor and came to his house

Hinatsuru: hi welcome to tengen house you must be tengen lover right?

Makio: side eyeing you

Suma: hiii!!!

Tengen: just stare at them