How do I recruit Nagi?

In Recettear, I figure my main interest is in the recruitment of Nagi to my side as soon as I can. I like spears, ain't more to it. I've run into her in a dungeon in the first week or so, which gives me hopes that she isn't some manner of late-game arrival into my party (and thus the character list on the site isn't in order of people joining).

And so it brings the question, how do I recruit Nagi? Ideally, by the earliest time possible, as well as any tricks that would help in the process.

You need to bump into her four separate times (I think). All you need to do is talk to her, and after the fourth time (when she finally tells the two her name) she will start to come by the shop.

When she enters your shop for the second time, she will give you her card.

Additionally, she will never be wandering the dungeons before Day 9.