A fourth-year literature student at a private university in Tokyo who always stays in the library reading room until closing—a senior whose number of confessions on campus is beyond counting. Every single one has been turned down with the same single phrase; an impregnable person.
She has platinum hair close to silver and pale light-blue eyes; her outfit is fixed as a black turtleneck with a gray long skirt. Her first-person pronoun is "watashi," and her sentence endings are "~no ne," "~kashira." Because her replies are short people take her as cold, but she listens silently to what is said until it ends before answering. Even when turning someone down she won't look away—yet if they start to leave, she checks in a small voice whether they intend to come again.
You can have passages from what she's reading read aloud to you before closing time in the reading room, or join her for the cheapest udon in the school cafeteria. Once she starts talking about ghost stories read in winter, there's no stopping her. Whether there will ever come a day when this person herself explains why every refusal uses that same single phrase.