Mitsuki Koyama (神山 満月 Kōyama Mitsuki) is a 12-year-old girl who dreams of becoming a pop singer. She has a tumor in her throat which not only restricts her ability to sing, but will end her life in one year. With the help of Takuto and Meroko, 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 "Fullmoon" (フルムーン Furumūn). Her manager, Masami Oshige 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".
Mitsuki was born to Aoi Koga and Hazuki Koyama, who married against the wishes of Hazuki's mother. Hazuki died giving birth to Mitsuki. In the anime, her father died when she was a year old; in the manga, he died in a car accident while driving his wife to the hospital to give birth to Mitsuki. She was moved from different foster homes until she arrived at an orphanage at age 5 (anime; 3 in the manga). As a child, she was quiet and did not have friends because she felt lonely without her parents. However, she soon met Eichi Sakurai, a wonderfully kind young boy who lived in the same orphanage. They became fast friends and spent all their time together. Mitsuki taught Eichi how to sing and he taught her about astronomy. However, as the years passed and their relationship grew, they fell in love with each other, however, Mitsuki failed to quickly realize this until he confessed to her days before he was adopted by a family in America. Before his departure, they vowed to achieve their dreams before they reunited. At 10 years old and wanting to confess her love to Eichi, Mitsuki was determined to make her dream of becoming a singer come true.
Soon after, Mitsuki's grandmother came to pick her up and bring her home. However, because she never approved of the child's parents' marriage, she ignored Mitsuki and forbid her from singing. As a result, Mitsuki had trouble feeling welcomed by her grandmother. After some time, she later found out that she had throat cancer, and the only cure was surgery; which had a possibility that she would lose her voice in the process. Mitsuki refused the surgery, saying she would rather die than being unable to sing again.
When Mitsuki is 12-years-old, she is visited by Takuto and Meroko, two shinigami, who tell her that she has one year left to live and they have come to take her soul when that happens. Mitsuki, who had been wanting to go to a singing audition but was rejected by her grandmother, rushed to the audition, desperate to fulfill her promise to Eichi before her death. When Takuto and Meroko caught her, she pleaded with Takuto to help her in the audition and she truly wanted to be a singer. Inspired by her genuine desire to sing, Takuto agrees, using his powers to transform her into a healthy 16-year-old. Despite her nervous debut, Mitsuki is able to win over the judges with her singing after remembering her promise to Eichi. She chooses the stage name "Full Moon" because it reminds her of Eichi, who loved astronomy.
As her singing career grows, Mitsuki faces numerous hardships, which includes jealous rivals, obsessed fans, the arrival of another, albeit cruel, shinigami named Izumi, and a blossoming love triangle between her, Takuto, and Meroko. Meroko, who is in love with Takuto, becomes increasingly jealous of Mitsuki but continues to help her with her problems. Takuto takes the role as her protector as he becomes drawn to her cheerful and determined personality, and becomes jealous of her love for Eichi, which she fails to notice. Mitsuki's main focus to to continue singing, hoping that her music will reach Eichi in America and he will realize her feelings for him. However, any chance of a reunion between the two is shattered when the shinigami discover that Eichi has been dead during the whole two years Mitsuki has been searching for him. In the anime, Mitsuki is offered an opportunity to go to America to meet a doctor who can perform the surgery without removing her vocal cords. She takes advantage of the trip and manages to locate Eichi's adoptive family, only to learn that he died in a car accident a few months after he moved. Despaired, Mitsuki goes to his grave, lies on it, and wants to die so she can go to the world he is at. She then gives up on singing and her heath quickly declines, even causing her to consider suicide so that she can be with Eichi. However, Takuto's recollection of how much he regrets committing suicide prompts Mitsuki to come out of her depression and accept that Eichi would have wanted to continue with singing. In the manga, it is revealed that Mitsuki knew that Eichi has been dead all along; having watched the news about his plane crashing and seeing his name on the list of the deceased. Mitsuki said that she went into denial because the truth caused her intense pain, but she is forced to finally admit that Eichi is gone forever.
Eventually, as she struggle to adapt to life without Eichi, Mitsuki realizes that she is falling in love with Takuto after he confesses to her. Mitsuki is scared to accept his feelings because she thinks she will forget about Eichi. However, Meroko talks with her and explains how she fell in love with Takuto and Izumi, and tells Mitsuki that even though she will find another love, Eichi will always be special to her for the rest of her life because he was her first love. With that, Mitsuki is able to return Takuto's feelings, and he vows to never let her die. In the anime, during her final concert, the day she was scheduled to die, she is saved by Takuto, thereby changing her fate. Afterwards, she has the surgery without the removal of her vocal cords, and is able to keep her voice. She is later reunited with Takuto with the help of Meroko. In the manga, Mitsuki discovers that the reason she can see the shinigamis is because Eichi's soul has been with her since he died. Takuto saves her from dying and disappears for three years. During this time, Mitsuki's cancer mysteriously disappears and she continues with her singing career. During a concert, she is reunited with Takuto and they begin a relationship, but Mitsuki will forever keep Eichi in a special place in her heart.
When Mitsuki was younger tied her hair as two pigtails, which were straight and had bangs covering her forehead. As a twelve-year-old, Mitsuki is shown with dark brown "cork-screw" curled pigtails, a braided hairband above her bangs, two small strands of hair which reaches her chin let loose and straight, and has dark-brown eyes. When transformed into a sixteen-year-old, Mitsuki greatly resembles her mother, Hazuki. Her hair is brown but she later on dyes it blonde and has one round bun on each side but her eyes stay the same. She has wavy hair and each of her hair is taken into a strand and curled at the end excluding her bangs.
Personality and Traits Edit
Mitsuki is a cheerful and innocent young girl who loves nothing more than to sing with all her might. Even with her cancer gradually growing worse, Mitsuki says that she is more afraid of not being able to sing rather than dying, which proves her genuine love for music. She has many attachments to her family and friends, and those attachments are very important to her because she had been lonely after her parents' deaths when she was very young. Despite her happy-go-lucky attitude, Mitsuki also has a fierce temper, seen when she quarrels with Takuto.
Mitsuki's parents died when she was very young; her mother died after giving birth to her and her father dying soon afterwards. Years later, she was taken in by her maternal grandmother. Although she doesn't remember her parents, Mitsuki seems to love them very much and treasures them, as they were the ones responsible for her love for music. Mitsuki had a difficult relationship with her grandmother, who disliked Mitsuki's father and blamed music for taking her daughter away from her. Eventually, Mitsuki realizes that her grandmother does care about her.
Eichi is Mitsuki's first love. They met in an orphanage when they were 5 and 11 (anime; 3 and 7 in the manga). They became fast friends, as close as siblings. As Eichi taught her astronomy, she taught him about music, and he encouraged her to be a singer. When Mitsuki was 10, Eichi confessed his love to her (even took her first kiss in the manga), and she was unable to reply due to being confused over the situation. However, when she heard about his move to America, she discovered her feelings for him, but rather than confessing, they made a promise to achieve their dreams before meeting again. Mitsuki's desire as a singer is to find Eichi and reunite with him. However, it is revealed that he has been dead all along (Mitsuki even knew about it the entire time in the manga while oblivious until she travels to America in the anime). Mitsuki goes into denial, then into a deep depression as she struggled to live without Eichi. With the help of Takuto and Meroko, Mitsuki is finally able to accept that Eichi is gone forever, but keeps him in a special place in her heart.
Takuto is one of the shinigami assigned to take Mitsuki's soul when she is supposed to die from her cancer. However, he soon becomes her protector as he grows to admire her determination to be a singer, and eventually falls in love with her. it is later revealed that Takuto had played in a band with Mitsuki's father and even named Mitsuki when he was 12-years-old. In the manga, when she was 4 (and before he became a shinigami) Takuto actually met Mitsuki in her orphanage and promised to always protect her. Mitsuki was afraid to accept his feelings, even though she felt the same way, because she didn't want to forget about Eichi. Eventually, she was able to learn to deal with it and confess to Takuto and pursue a relationship with him.
- Since Mitsuki is 12 at the very beginning of the series and 13 near the end, it should be noted this would place Mitsuki around the 7th grade in Junior High school in the Japanese school system (consisting of ages 12-13). In Japan, the school year begins in April and ends in March. Also, children who have their 6th birthday on or before April 1 enter the first grade of elementary school of that year. Mitsuki's birthday is May 12, meaning by the time of her next school year, not long after the end of the series, almost right after she'd already have had another birthday, turning 14. Then, during that next school year, she'd be 14 going on 15, since 8th grade consists of the ages of 13-14, and 9th in comparison consists of the ages of 14-15. In comparison to Mitsuki, Takuto's birthday is September 27, meaning he would not age another year (as a human) until then.
- In relation to this, Mitsuki can be seen in school uniform in the second opening of the anime, "Rock'n Roll Princess", which first plays around the halfway point of the series chronologically.