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Tokisaki is an ordinary junior high school student who has a gloomy personality due to his parents' divorce. Because of a friend's recommendation, she went to see the concave and convex world, and ended up falling into it and couldn't extricate herself. An accidental dark force eroded the monsters in the concave-convex competition, causing many contestants to disappear for no reason. The creator of the concave-convex world found Tokisaki. So Tokisaki woke up after a nap and found that she seemed to have traveled through time. Let's see how she shines in the crisis-ridden bump competition!