Letter Association Quests

The letter association often has jobs for you to accept. The rewards differ, depending on the mission. You either get CB, items, of maybe even something completely different. Dandee will also tell you what level is best recommended for your team to do the job. 
There are 3 kinds of Jobs, Story Jobs, Side Jobs, and Bond Jobs. Once you've received a Job, you can also show Dandee the Job Letter to gain more information about your mission, for example where it lies or what to take care of.
==Story Quests==
Story Jobs, as the name says, progress you in the story and are most of the time also more difficult than Side Jobs. They also have often more requirements that have to be met until you can find them available from Dandee. 
Color: RED
==Side Quests==
Side Jobs can optionally be done, but don't have to. They can sometimes hold a secret Desire that you can only obtain by finishing this job. Many Side Jobs tend to have special requirements appear. 
Color: GREEN
==Bond Quests==
Bond Jobs are basically a big part of the the romancing routes. Though they aren't everything that the routes hold, sometimes you can only progress someone's route by accepting these jobs. Bond Jobs are similar to Story Jobs in the sense that they all connect to one another, only each character has their own story. They can also be incredibly difficult, depending on how far you are in someone's route or which character you're trying to romance.
Color: PINK