Luna is a childhood friend and rival of San. She has used the powers of her mermaid voice to become a pop star idol singer. She seems to suffer from a superiority complex, and she never passes up an attempt to overshadow San. She initially thought that San was boasting Nagasumi to her, and in an attempt to outdo San she decides to steal him away from her by making Nagasumi her servant, since Nagasumi has also seen her mermaid form. Later she decides to live in Nagasumi's house until his servant status is over.
Vova
