Erii Ishioka worked as a crew member handling guest seating on the Hyper Linear, a vacuum-tube superconducting bullet train reaching 1,000 km/h. She was part of the team for its inaugural journey timed with the Tokyo World Sports Games (WSG) opening ceremony. During a pre-departure briefing for selected passengers, including Conan Edogawa, Ran Mouri, and the Detective Boys, she appeared with WSG public relations representative Maiko Shirahato and the train's chief engineer, Osamu Inoue. In this briefing, Ishioka presented key operational details of the Hyper Linear. A significant moment occurred when she inadvertently revealed a planned surprise: WSG Committee President Alan McKenzie intended to unveil a large flag made from participating nations' flags upon the train's stadium arrival, information meant to be confidential until the event. No additional background, character development, or appearances in other seasons, movies, OVAs, or spin-offs are documented.