Midnight Secretary is a popular Josei manga book on Amazon. It tells the story of Kaya Satozuka, a hardworking secretary who is assigned to work for her new boss, Kyohei Touma. Little does she know that Kyohei is a vampire, and he has chosen her to be his personal secretary. As Kaya delves deeper into the world of vampires, she finds herself drawn to Kyohei in ways she never expected. This manga explores themes of romance, power dynamics, and the struggle between duty and desire.