Full Moon wo Sagashite

Plot
12-year-old orphan Mitsuki Kouyama is a talented singer who dreams of becoming a singer, but she is afflicted with sarcoma, which is curable only through a surgery that could ruin her vocal cords, and destroy her ability to sing. The tumor in her throat already affects her ability to breathe well and sing loudly. Her grandmother also hates music and is completely opposed to Mitsuki's wish to audition. Mitsuki’s dreams seem impossible to achieve, until one day she is visited by two shinigami, whom only she could see. The shinigami, Takuto and Meroko, inadvertently tip Mitsuki off that she has only one year left to live.

Mitsuki then realizes she cannot wait any longer to fulfill her dream, so she runs away from home and the shinigami, to try to audition for a singing competition. However, the shinigami stop her before she is able to audition. She moves Takuto, the male shinigami, to agree to a compromise: If Mitsuki promises to go quietly when her year is up, he would help her become a singer, so she could leave the world with no regrets. Takuto gives her the ability to transform into a completely healthy 16-year-old, so that she could meet the age requirements of the audition, and sing without hindrance.

Despite heavy competition, Mitsuki wins over the judges with her excellent voice and her enthusiasm for singing, sealing a contract with Seed Records. To conceal her true identity, she chooses the stage name "Fullmoon".

Mitsuki had decided to become a singer two years before, when she was 10 years old. She had made a promise with Eichi Sakurai, a 16-year-old boy she met at her orphanage, that the next time they met, they would both be closer to their dreams. Eichi wanted to become an astronomer and Mitsuki wanted to become a singer. Shortly after, Eichi was adopted and emigrated to America before Mitsuki could express her feelings for him. Mitsuki hopes that by becoming a famous idol, Eichi would be able to hear her sing and realize her feelings for him. This is a tale of growing up, falling in love, awareness of life and death, and desire to move forward.