How should I call you?

Just call me "Junker".

Kuzuya-san, you have a beautiful name. Kuzuya=the one who sells junk (kuzu). Also, "ya" is a common suffix for names, originating from the same "seller".

It's a name of my job.

Oh, is that so...

Then, please call me "the planetarian of Hanabishi Department Store Rooftop Planetarium"

I'm not gonna call you something that long.