Shirayuki Hotogi, born November 14, 1992, is the eldest daughter of the Hotogi family, raised at their secluded shrine in Aomori Prefecture. Her childhood involved rigorous training in shrine maiden duties and combat, honed through frequent ambushes by younger sisters wielding live weapons. This isolation ceased when Kinji Tohyama's family visited, sparking a childhood friendship that evolved into lifelong devotion. She later enrolled at Tokyo Butei High School, reuniting with Kinji as a second-year student. At Butei High, Shirayuki holds multiple leadership positions, including Student Council President and head of the gardening, handicrafts, and girls' volleyball clubs. Academically exceptional, she consistently achieves top scores. As an A-ranked Butei, she specializes in the Supernatural Search Research (SSR) department, focusing on paranormal investigations. Her daily routines involve preparing meals for Kinji and maintaining his living space, reflecting her unwavering commitment to his well-being. Her personality blends traditional Yamato Nadeshiko traits—polite, reserved, and domestically skilled—with extreme jealousy and yandere tendencies. She exhibits violent outbursts against females perceived as close to Kinji, such as attacking Aria H. Kanzaki upon discovering her cohabitation with him. Her possessiveness extends to spying on Kinji and practicing combat on Aria-themed dummies. Despite combat confidence, she harbors deep-seated insecurity, fearing others value her only for status and her death would go unmourned. A lesser-known facet involves a perverted streak, including intentionally wearing erotic underwear and staging intimate scenarios with Kinji. In combat, Shirayuki wields flame-based abilities through Kidoujutsu (Hotogi Heavenly Arts), enabling fire manipulation, divination, and healing. Her primary weapon is Irokane Ayame, a Japanese sword capable of deflecting bullets and slicing through structures like train cars. The hair ribbon she wears suppresses her true power; its removal unleashes her full abilities and alters her demeanor. Her true identity is Himiko (Scarlet Priestess), reflecting her pyrokinetic potential. Unsealed, her flames envelop the sword and incinerate adversaries. Her relationship with Kinji defines much of her character. She obsessively plans a future with him involving marriage and six to seven children, maintaining a phone wallpaper featuring his image. This fixation fuels rivalries with Aria, Riko Mine, and others, leading to elaborate contests for his attention. As a core member of Team Baskerville, she provides tactical mission support. Key developments include kissing Kinji during a school festival and later escalating efforts to win his affection, including nudity as a desperate measure. Her half-sister Konayuki Hotogi also appears within the narrative.