Tomoe Takasago is a 15-year-old high school freshman with blood type A, working at her father's Takasago Bookstore. Her delicate, feminine appearance features long, smooth black hair, blue eyes, and a height of 153 cm. Her friendship with Masamune Izumi began when her father apprehended the suspiciously behaving author during his visit to monitor his own light novel sales. This encounter made Tomoe one of the few privy to Masamune's secret career. She maintains a kind and supportive attitude towards him, often recommending books tailored to his tastes, while strictly enforcing bookstore rules and scolding anyone causing disturbances—including Masamune. Tomoe displays humor, notably comparing his rivalry with Elf Yamada to a boys' love novel. Romantically interested in Masamune and identified as a love interest in his story, Tomoe also engages with him professionally. She leverages her literary expertise to identify popular or high-quality books and accurately predicts titles matching his preferences. An ardent fan of Muramasa Senju's light novels, she actively defends the genre against criticism. Her surname, Takasago (高砂), combines "tall/high" (高) and "sand/grit" (砂). Her given name, Tomoe (智恵), means "wisdom," reflecting her role as the bookstore's knowledgeable attendant.