Amane Kaoru is a cheerful sixteen year old who suffers from an unusual disease called xeroderma pigmentosum. Because of this illness, any exposure to sunlight could be deadly for her. Kaoru only ventures outside at night, finding happiness in being a street performer. When she meets Kouji, a boy she has often watched from afar, she shares with him her dream of one day becoming a real musician. Unfortunately, Kaoru's disease worsens every day, until finally she can no longer play her guitar. Despite this, her optimism never wavers, and with Kouji's help she continues to work toward her dream.