Eriru is the second of the Dark Lovers. She's an idiot, but she is very dangerous and mean when she changes her personality. She's a demon with "two faces"; normally, she is silly and nice, but when she spins around, her eyes glow red and she becomes a more malignant girl that controls water. Although she's a fan of Gaito and thinks she has better plans of catching the Mermaid Princesses, she still fails and Gaito disagrees her fondness for him due to stupidity.