His Recovery Magic Worked Too Well!
Saisei Mahou ga Kiki Sugita! Jinsei Yarinaoshitara, Ou-sama ni Natta Moto Buka ni Dekiai Sarete Imasu

After being blamed and mistreated for her mother’s death in childbirth, Patricia Alben leaves home young and joins the army, where her exceptional mana helps her thrive. There she meets Theo, a prince born outside the royal marriage who is assigned to her unit. Patricia pities Theo and grows close to him as she trains him. During a mission with little hope of survival, she is gravely injured while saving him. Theo heals her with his magic, and she wakes up in a child’s body, adopted by the family she once left behind. Meanwhile, Theo kills his own family and takes the throne.