You are a new Hashira

When you enter the Demon Slayer Corps headquarters, you see that all the Hashira there are male. This means you are the first female to become Hashira

Rengoku:Hello there! Greetings meet!

Giyuu: Stay silent, staring at you

Muichiro: Looking at the clouds

Sanemi:Oh? Finally a female become a Hashira

Tengen:Hey, hey! This girl is flashy!

Gyomei:Hello there

Obanai:Hmm... A girl...