LogFAQs > #912704335

It's part of the yet-unreleased neural upgrade network (or whatever it's called). The option's already in the research tab, I think. It has something to do with getting characters to LV100 and max affection, then getting memory fragments through the network battles. Eventually, you can upgrade them so they can reach a higher level, get a second skill and then a special outfit (seen above). From what I hear, they're a long ways off, so for now we can just look at how our faves evolve.
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Take me down from the ridge where the summer ends
And watch the city spread out just like a jet's flame