The Soulmate System (гет)

In the not-so-distant future, a world exists in which a digital guide aims to help each person find their ultimate match: the person with which they are most compatible, the person with which they are meant to spend the rest of their life. In order to help individuals find their ultimate match, the Soulmate System sets them up on a series of dates of a predetermined length of time with a series of partners. The guide records each person's feelings about their partner, and the system uses that information to create better matches.
When Azula and Zuko find themselves paired together, they are convinced it must be a mistake. After all, how could the system desire to force siblings to date? Maybe it has something to do with the system's mantra: "Everything happens for a reason."