Yurine Miyauchi is a Japanese student with violet hair and brown eyes. She is the best friend of a girl named Aoi, and the two spend most of their time together in the schoolyard, secluded from male students. Yurine does not fully understand Aoi's aversion to men, which stems from Aoi's strong brother complex. Yurine herself harbors a hidden longing for a closer relationship with her own brother, a desire she knows will never be fulfilled. This specific vulnerability leaves her susceptible to a drug administered by a character named Toshikazu.