a story (preferably, a book) where in the first 1 or 2 parts there are four people, they are friends, main characters, do stuff, it seems they're inseparable and all, but then.... In the next parts the story shifts, the 3 characters leave or become villains, and 1 character remains to carry the story alone.... presumably.... but they gain new friends with which they are even more powerful..... just a thought













