Lunar Edomae  

, 江戸前 留奈

Lunar is a childhood friend and rival of Sun who became a pop star idol singer using the powers of her mermaid voice. She appears to have an inflated sense of self-worth, constantly seeking to one-up Sun in every way possible. Initially, she believed that Sun was boasting Nagasumi to her, prompting Lunar to attempt to surpass him by making Nagasumi her servant and stealing him away from his original owner. Eventually, Lunar decided to reside at Nagasumis house until his status as a servant expired.