Lalatina, a country Earl's daughter, remembers her past life when she was eight years old. It was her final memory as a pharmacist who met her end alongside a Knight praised as a hero. Compared to her harsh past life caught in the turmoil of war, she lived fulfilling days loved by her warm-hearted family in this life, but every time she thought of the Knight she loved, she shed tears in secret. However, Laratina does not yet know. That the Knight had been reincarnated in the same era as a deaf Marquess's son——. A fleeting yet beautiful reincarnation engagement story about a love spanning a hundred years.