Michiko would be bitchy right back.
I don't think they would get along at first but maybe since they both love books they'll warm up to each other, slowly.... Honestly I would think the two would get along best, but that's just me.
Akina would just kind of brush off Bijin's rudeness... But honestly Akina wouldn't like how she treats customers.... Anyone who works retail must be friendly to customers. Although Akina wouldn't necessarily be hurt by it herself, she could handle it.
I guess they could talk about romance novels, don't know how much Bijin likes the genre though. XDD And once Akina starts talking about them, it's hard to stop her and her hopeless romantic self will bloosom... :'D
Susumu would try to flirt with Bijin
Takeshi would be a little uncomfortable with the rudeness and just get flustered and walk out, never coming back to the bookstore again. x'D
(Assuming they would all walk in her bookstore... Doubt any of the Tsukikage Kuragari would met her... )