A genius alchemist, Glass Demelias, lived a life plagued by misfortune, becoming an orphan, then a street child, and even nearly murdered by his adoptive father. Afflicted by a disease at a young age, Glass pursued his final research to defy death. However, for violating a taboo, he was sentenced to execution by the Goddess's agent — a Divine Human.

Although Glass was condemned without even being able to resist, the Goddess Aurora praised his alchemical achievements during his life and granted him the opportunity for 'reincarnation'. Normally, Glass would have been reborn as a new life with all his memories erased, but through the sole discretion of another goddess, Fortuna, he was reincarnated while retaining his memories.

Glass was reincarnated three hundred years after his death. Reborn as a baby girl, Glass was named Leaf by her parents and began a new life.

This is the story of a lonely alchemist who, not knowing what happiness is, learns about love and ultimately grasps happiness with her own hands.