As a tester for the world’s first medical-use Full-Dive device, the Medicuboid, Yuuki has been diving into virtual worlds from the hospital. Terminally ill and unable to leave her sterile hospital room, she longs to go to school one more time. To make that wish come true, Asuna enlists the aid of Kazuto and some friends from school, and Yuuki is able to experience a day at their school. After classes, Yuuki tells Asuna that there’s just one more place that she’d like to visit, and guides Asuna to the house where she once lived with her family.

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