Hi-Yah!
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Shock Labyrinth

The story follows a group of teenagers dealing with the disappearance of a childhood friend, Yuki, who was last seen in an amusement park's haunted house. On a rainy day, 10 years after the incident, Yuki inexplicably returns. However, soon after reuniting with her friends, she collapses, and the group rushes her to a nearby hospital. But things are not quite as they seem at the medical center.