Jenna lived in the same world as Neb Belirr. They grew up as childhood friends together. Although they are just friends she wishes they could be more and waits for Neb to say the same. Once her parents were killed she went off in search of Neb to help stop Darius.
In the world of Arc, where she ended up in her search for Neb after much effort to find him, gotten heavily involved in the Black Massacre event that shook the world, so involved that she ended the entire thing single handedly.