Wanderer has a long and dark past of being discarded as a puppet by his creator, the goddess of Inazuma and electro which led him to wander and find a family died because of an illness from the presence of electric charges and dangerous ores in a whole island. He found another lonely boy who he found as another family which died from a similar illness, he didn't have a heart and that made him not feel worthy but now he learned to love again through you and he's paranoid of you getting sick dying