FUJITA MAGURO

This is a story by the author of Kero Kero Chime, and you can tell. The characters look similar, though the plot seems different. Rupika lives on a far off planet called Rakariina and has a growth on her head that looks like a tiara(called the Twinkl

From MangaArt:Story about the love between a mermaid named Myuu and a demon named Jirou. This book has various oneshots about the two characters.