Shion Fujino, a high school student with violet hair and eyes, presents a quiet exterior that masks a world of intense private fantasies and assertive sexual agency. Known for her reserved demeanor and near-silent presence among classmates, she contrasts sharply with her unrestrained use of sexual devices, habitually integrating tools like vibrators into public settings—such as a crowded train ride where classmate Fukaya discovers her. This encounter sparks a physical relationship defined by Shion’s gift of a remote control for the device and her pursuit of heightened desires.

Her compulsions escalate after consuming a libido-enhancing potion from Mita, a peer whose interference drives Shion to reckless encounters with Fukaya in a school bathroom, leading to her collapse. Mita’s manipulation of Fukaya’s memory loss further complicates their dynamic, temporarily positioning herself as his girlfriend. Though external pressures strain their bond, Shion and Fukaya repeatedly reconnect through physical intimacy, navigating jealousy and emotional vulnerability.

Shion’s actions, including using a waterproof vibrator during a pool outing, risk exposure despite lacking exhibitionistic intent. Her enigmatic nature—a blend of social withdrawal and unapologetic sexual expression—anchors conflicts between private compulsions and fragile connections, adapting to disruptions like rival affections and altered memories while maintaining her unconventional agency.