Mitsuki Kouyama (神山 満月 Kōyama Mitsuki) is the main protagonist of Full Moon o Sagahite, and the 12-year-old granddaughter of Fuzuki Kouyama and the daughter of Aoi Koga and Hazuki Kouyama. She dreams of becoming a pop singer and has a tumor in her throat which not only restricts her ability to sing, but it will end her life in one year. With the help of Takuto Kira and Meroko Yui, the shinigami assigned to collect her soul, she is able to transform into a 16-year-old to fulfill her dream with her remaining time. She was discovered by Seed Records and signed with them under her stage name "Full Moon" (フルムーン Furumūn). Masami Ooshige (Mitsuki's manager) helped her through the beginning of career. Soon after her discovery she released her debut single, "Myself". Her second single, "Eternal Snow", was chosen from three potential songs. In the manga, Fullmoon's first and second singles are entitled "Angel" and "Missing Link". Her songs in the epilogue are "Smile" and for the final song called "New Future" (which is her first song in the anime).