The protagonist of the tale is a woman with very vivid memories of her previous life. Even if reincarnation occurs to all humans on Earth, only Luna, the girl, is able to recall it after experiencing a new birth. She loved and gave her life to a man she had fallen in love with in a previous life. However, Luna's life was cut short when she perished in an car accident. She vowed to find that man and to be with him once more after she was reborn. While completing her mission and continuing her journey further, she finally came across other people who share the same type of extraordinary ability like her. The title 'metempsychosis' comes from a deeper understanding of the word 'reincarnation' which means rebirth or being born again after death.