If I remember correctly this was one of the "GO TO PLAYONLINE!!" things in the game, so I never really had ready access to what I was supposed to do whenever I played.

For those who don't know, the official walkthrough really wanted us to look at Square's site "PlayOnline" so many side quests were only half described, and would end with "Find out more on PlayOnline".

I did have another walkthrough, but it was clearly written by people who didn't know how the Coffee Quest worked as they only mentioned one coffee, and then forgot about it.