My Crimson Soulmate

The narrator is Nathan, a young man who has lost his memories due to an accident. He has a job in a small office as an assistant manager, and his boss is Amber Alves, a woman with beautiful red hair and blue eyes. Amber is like a Tsundere character in anime, and Nathan finds it hard to stand in front of her. However, one evening, he learns that she has another side that no one sees. He falls for her, but is unsure if he will fall for her.