I think she's his mom. I'm assuming she has him call her by name because she's young and doesn't want to be called "mom". I don't think it was ever explicitly stated though, so I could be wrong.Thx for the TL
When in doubt, get them drunk lmao.
Whats their relationship with mika? i forgot, she his aunt or somthing
Yup, it was never explicitly stated but we got many hints such as Yuusei living in her house (above the bar), Femme Fatale calling Mika "Mama-san" (not sure about the honorific used) and Mika refering to Yuusei as "my idiot".I think she's his mom. I'm assuming she has him call her by name because she's young and doesn't want to be called "mom". I don't think it was ever explicitly stated though, so I could be wrong.
To be fair, Mika is a head of a hostess bar, and that's often how female keepers of brothels and brothel-adjacent establishments are called accross the world, Japan included; female keepers of hostess bars are most definitely called so.Femme Fatale calling Mika "Mama-san"
It's a snack bar (スナック), more casual and less prostitution-adjacent than a hostess club. Other than that nitpick you're spot on with the rest of your analysis.Mika is a head of a hostess bar