There was already a story about Undine before, but although outwardly they and mermaids do not differents, in fact they are different in nature Ondines are spirits of the elements who live in their own dimension. Mermaids live in the human world and cannot enter the dimension of elementals. Girls who have given themselves the elements of water become mermaids. (This is such a beautiful euphemism for, guess what.) Like the undine, a mermaid can enter into a contract with a person, but only…
