Mitsuki loves singing, but a malignant tumor in her throat has prevented her from pursuing her passion. However, Mitsuki's life turns around when two fun-loving Shinigami appear to grant her a temporary reprieve from her illness--and give her singing career a magical jump-start.

Mitsuki is trapped by the Lord of the Underworld and is imprisoned within his barrier. She pleads for Izumi to come help her, but the Shinigami is immobilized by his fear of releasing his last memory--the moment before his death--and will not rescue her. Is there anyone who can protect Mitsuki from the Death Master's scythe?