Upon his arrival in Orario, Bell dreams of picking up girls in a dungeon, joining a familia, and becoming a hero. For a main character, it should be easy, right? However, the world is far harsher than it seems, as reality doesn't take kindly to one's fantasies.
How would Bell survive if not for Hestia? Simply put, he wouldn't, unless the circumstances of him not meeting Hestia led to different outcomes, such as joining a different familia.