Its about a girl name Mitsuki who LOVES to sing but due to the fact she have throat cancer. She later see shinigamis and they accidently told her she only have 1 year left to live. So Takuto(one of the shinigamis) helped her make her dream come true so she wont regret anything when she die. Takuto turned her into a 16 yr old and shes Full Moon.(singer) Then later on Takuto and Meroko(the other shinigami) wanted to help Mitsuki and dont want her to die. Takuto remiembers hes memory when hes alive and he isnt a full shinigami yet so he's gnna turn into a ghost but Meroko got this flower thingy dat make him forget hes memories and wont be a ghost.Death(leader of the shinigamis i think) turn Meroko into an angel along with Izumi and Takuto becomes human and Mitsuki's throat got cured.
ITS A REALLY GOOD ANIME!! you should really watch it ^^
Full Moon focuses on a 12-year-old girl named Mitsuki Kouyama. Mitsuki is a talented singer who dreams of becoming a pop idol, but she is afflicted by throat cancer, which is curable only through a surgery that has the possible cost of her vocal cords and never being able to sing again. At the beginning of the series, she is visited by two shinigami whom only she can see, Takuto and Meroko, who go by the team name "Negi Ramen" or "Spring Onion Noodles" ("Green Onion Ramen" in the English dub). These shinigami accidentally tell her she has but one year left to live. Mitsuki realizes she cannot wait any longer and attempts to achieve her dream of becoming a singer. However, she does not look old enough to be a singer, so she makes a deal with one of the shinigami, Takuto, to transform her into a 16-year-old. In her 16-year-old form, her throat is healthy, and she is able to sing without any difficulty. She uses the stage name "Full Moon" to hide her identity from the public. To start a career as a singer, 16-year-old Mitsuki auditions in a singing contest. Though there is much competition, she is able to win over the judges with her enthusiasm for singing and her excellent voice.
Mitsuki decided to become a singer two years before the shinigami's arrival, when she was 10 years old. She made a promise with Eichi Sakurai, a 16-year-old boy she met in her orphanage, that they would both achieve their dreams together. Eichi wanted to become an astronomer and Mitsuki wanted to become a singer. Shortly after, Eichi was adopted and immigrated to America before Mitsuki could express her feelings for him. Because Mitsuki is fated to die, she is intent on achieving her dream and meeting Eichi before her death. Mitsuki hopes that one day Eichi will hear her songs and return to her so they can be together again.
Shortly after her first audition to become a singer, the plot of the manga and anime of this series separate. The plot of the manga and anime have some common themes, but they become quite different as the story advances. In addition, several of the characters in the manga have different histories and personalities from their counterparts in the anime.