Zense Juusha datta Koushaku-sama ni Dekiai Sareteimasu

My Past-Life Servant, Now a Duke, Is Madly in Love with Me summary: Amelia Fatal, who died a lonely death as a countess, has been reincarnated and is now living a busy but contented life as a maid in a ducal household.
But a terrible error was committed... In her previous life, Lewis had served her, and in this life, he had been reincarnated as the young head of this ducal family! Amelia is confused by Lewis’s all-consuming love, but she is edging ever closer to the truth of her own past life and death.
A timeless love story switching the roles of master and servant, loyalty beyond time!