Shiori Matsuura serves as a bookstore clerk, appearing exclusively in the series' third episode. During an interaction with a customer returning a book, she realizes this marks her third ordering error. Panicked, she offers to rectify the mistake. The customer rejects verbal apologies and demands to see her panties, provoking her visible disgust. Her disappointment specifically arises from the customer not being gay, clashing with her assumption that male book enthusiasts prefer yaoi material. This panty-reveal scenario aligns with the series' established premise. Her role remains confined to this situational narrative, with no additional appearances, backstory, relationships, or development in other seasons, films, OVAs, or spin-offs.