Full Moon wo Sagashite

Full Moon o Sagashite is a Japanese shōjo manga by Arina Tanemura about 12-year-old Mitsuki Koyama is a talented singer who dreams of becoming a pop idol, but she is afflicted with sarcoma, which is curable only through a surgery that could cost her vocal cords and her ability to sing. The tumor in her throat also affects her ability to breathe well and sing loudly. On top of that, her grandmother hates music, and is completely opposed to Mitsuki's wish to audition. Her dreams seem impossible to achieve, until one day she is visited by two shinigami whom only she can see. Without knowing Mitsuki can see and hear them, they discuss how she only has one year left to live.