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.