Nanamine Sakura presents as a third-year student at Kamome Academy and a broadcasting club member. Despite this appearance, she is a century-old supernatural entity confined to the school grounds, having died under unknown circumstances during the Meiji era. Her consistent winter uniform and aversion to cold suggest her death likely occurred in winter. Sakura's core motivation is escaping her century-long confinement, though the exact nature of her wish remains unspecified. She maintains a contract with Yugi Tsukasa, exchanging unspecified services for his assistance in achieving her wish. This alliance casts her as an overarching antagonist, collaborating with Tsukasa and Hyuuga Natsuhiko to manipulate events involving the Seven Mysteries, whom she may appoint or oversee. She interacts seamlessly in the human world as a student. Sakura possesses green hair styled in an asymmetrical bob with short bangs, featuring two braids extending from her crown to her ears and long sections framing her face to her chest. Her green eyes, flecked with yellow, are often half-closed, contributing to a perpetually disinterested expression. She consistently wears Kamome Academy's winter uniform accessorized with a red gem brooch above the bow, paired with yellow stockings featuring brown stripes and garters. Alternative attire includes a black tea party dress with bishop sleeves, white accents, and boots for formal events, and a maid outfit for class activities, always retaining her signature brooch. A spin-off gag depicts her temporarily transformed into a taller, more muscular male form wearing a modified male uniform with the same brooch. Sakura exhibits an aloof, emotionally detached personality, rarely displaying overt emotions beyond occasional polite smiles during initial encounters or annoyance directed at Natsuhiko and Tsukasa. She maintains emotional distance to rationalize her dealings with supernaturals, likening Tsukasa to "a cat" despite finding his actions distasteful. She expresses genuine interest in befriending Yashiro Nene due to their shared status as humans bound to supernaturals, offering hospitality while simultaneously executing Tsukasa's requests that compromise Nene, demonstrating strategic deception. Her abilities include communicating with kokujoudai for information gathering and perceiving other supernaturals, likely facilitated by her contract with Tsukasa. She favors the snack rakugan, admires the historical figure Fukuzawa Yukichi (a subtle clue to her Meiji-era origin), and exhibits stoic disregard for lightning.