Chichi wa Eiyuu, Haha wa Seirei, Musume no Watashi wa Tenseisha.

Dad is a Hero, Mom is a Spirit, I'm a Reincarnator follows eight-year-old Ellen, a girl born of both spirit and human blood who can manipulate the elements of the periodic table rather than the traditional four elements. Her unusual power is matched by the scientific knowledge she retained from a past life as a scientist, giving her an advantage few in the Spirit Realm or the human world can understand. The story also centers on Rovel Vankreift, the hero of the Kingdom of Tenbahl and eldest son of house Vankreift. During a war against a neighboring kingdom, Rovel is fatally injured, but the spirit who fought beside him, Lady Origin, saves him by bringing him to her realm. Lady Origin is not only the Queen of the Spirit Realm, but also Ellen's eventual mother, making Ellen's family bond as extraordinary as her abilities. As Ellen, Rovel, and Lady Origin try to live together in peace, they are drawn back toward the Vankreift household to protect their relatives' honor. At the same time, they must keep Ellen's dangerous existence hidden from the public, because their greatest wish is to preserve the quiet happiness they have only just found.