Nidome no Jinsei, (Moto) Zaiaku no Seijo wa Zense de Shounen Datta Reitetsu Koutei ni Hirowareru

Saintess Angelina had devoted herself to her country, only to have her powers unknowingly used to fuel a war. She bonded with a boy, Dilhade, in the lonely imperial palace, but was killed by him—he was a surviving member of the enemy royal family. When she awakens, she is reincarnated with memories of her past life――?! Now 16, living a second life as a mistreated servant in a count’s household, she unexpectedly reunites with Dilhade, who is now 24 and the new emperor. Taken in by him, she finds herself the object of his overprotective affection…?! An age-reversed, sweet and indulgent love fantasy begins here! (Source: Starts Publishing, translated)